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70 B body tach hole #599026 01/31/10 12:46 AM 01/31/10 12:46 AM
Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada D DPelletier OP I Live Here
DPelletier OP I Live Here D Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada	There was a thread here a while back, but I guess I forgot to print out the info sooooo: Can anybody tell me the size and location of the hole in the firewall for the factory grommet used on a 70 B body with a tach? Pics? I think it's right next to the bulkhead wiring block, but.... Thanks Dave 1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]

Re: 70 B body tach hole [Re: DPelletier] #599027 02/01/10 11:21 AM 02/01/10 11:21 AM
Joined: Dec 2003 Posts: 3,524 Lansing, MI 70gtx440dana master
70gtx440dana master Joined: Dec 2003 Posts: 3,524 Lansing, MI	Here is a picture....not sure on the size! 5774106-70chargertachwiringpicture.jpg (1980 downloads) 70 Road Runner 383-4 4 speed FJ5 & black guts 70 Charger R/T 440-4 4 speed FJ5 & white guts

Re: 70 B body tach hole [Re: 70gtx440dana] #599028 02/01/10 12:22 PM 02/01/10 12:22 PM
Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada D DPelletier OP I Live Here
DPelletier OP I Live Here D Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada	Thanks a bunch! hmmm, not where I thought it'd be; is it a factory tach car? What is the cable directly opposite the firewall bulkhead connector? Cheers, Dave 1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]

Re: 70 B body tach hole [Re: DPelletier] #599029 02/01/10 12:49 PM 02/01/10 12:49 PM
Joined: Jan 2003 Posts: 4,764 near Port Huron, MI Paul master
Paul master Joined: Jan 2003 Posts: 4,764 near Port Huron, MI	I added a factory tach to my Road Runner many years ago. I had aquired an original tach harness, and used a set of calipers to measure the narrow part of grommet then bought a hole saw at the local hardware store to match. I don't remember the exact size, but 1/2" comes to mind. It was a common size and the grommet fit perfectly.

Re: 70 B body tach hole [Re: Paul] #599030 02/01/10 02:54 PM 02/01/10 02:54 PM
Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada D DPelletier OP I Live Here
DPelletier OP I Live Here D Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada	Thanks Paul; was it in the same location as the one in the picture above? Dave 1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]

Re: 70 B body tach hole [Re: DPelletier] #599031 02/01/10 04:49 PM 02/01/10 04:49 PM
Joined: Dec 2003 Posts: 3,524 Lansing, MI 70gtx440dana master
70gtx440dana master Joined: Dec 2003 Posts: 3,524 Lansing, MI	Blue and black wires next to gray tach wire are for the headlight door system on a 70 Charger. I am not sure about the other cable/wire you are questioning without having a look underhood. 70 Road Runner 383-4 4 speed FJ5 & black guts 70 Charger R/T 440-4 4 speed FJ5 & white guts

Re: 70 B body tach hole [Re: 70gtx440dana] #599032 02/02/10 01:15 AM 02/02/10 01:15 AM
Joined: Nov 2005 Posts: 87 Oregon R RT03 member
RT03 member R Joined: Nov 2005 Posts: 87 Oregon	This is where the tach hole is drilled on my 70 GTX. It's a factory tach car. The hole diameter is about .830". 5776166-DSC01924.JPG (836 downloads)

Re: 70 B body tach hole [Re: RT03] #599033 02/02/10 12:10 PM 02/02/10 12:10 PM
Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada D DPelletier OP I Live Here
DPelletier OP I Live Here D Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada	Ahhhh; that's where I thought it should go as opposed to the grey car pictured above..... Thanks! Dave 1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]

Re: 70 B body tach hole [Re: DPelletier] #599034 02/02/10 01:19 PM 02/02/10 01:19 PM
Joined: Dec 2003 Posts: 3,524 Lansing, MI 70gtx440dana master
70gtx440dana master Joined: Dec 2003 Posts: 3,524 Lansing, MI	Dave, Here is another picture of a tach wire. It only adds more confusion. I guess I would like to see a few more unmolested cars to confirm. 5776881-hemienginepic.jpg (624 downloads) 70 Road Runner 383-4 4 speed FJ5 & black guts 70 Charger R/T 440-4 4 speed FJ5 & white guts

Re: 70 B body tach hole [Re: RT03] #599035 02/02/10 01:28 PM 02/02/10 01:28 PM
Joined: Dec 2005 Posts: 335 Olympia WA R rocketresto enthusiast
rocketresto enthusiast R Joined: Dec 2005 Posts: 335 Olympia WA	Quote: This is where the tach hole is drilled on my 70 GTX. It's a factory tach car. The hole diameter is about .830". I currently have two Super Bees in the shop, a 68 and a 70, both are original tach car and both have holes in the same place as your GTX. Mike

Re: 70 B body tach hole [Re: rocketresto] #599036 02/02/10 02:15 PM 02/02/10 02:15 PM
Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada D DPelletier OP I Live Here
DPelletier OP I Live Here D Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada	Well, we have 3 different locations listed but three cars which people have stated are original tach cars have them in the same spot as the pic of the '70 GTX, so that location is in the lead so far! Thanks guys; if anyone has any more info or pics; lets see 'em! the holesaw is coming out in the next couple of days! Dave 1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]

Re: 70 B body tach hole [Re: DPelletier] #599037 02/02/10 02:19 PM 02/02/10 02:19 PM
Joined: Sep 2003 Posts: 3,426 weymouth,mass. M meepmeep70 master
meepmeep70 master M Joined: Sep 2003 Posts: 3,426 weymouth,mass.	curious

Re: 70 B body tach hole [Re: DPelletier] #599038 02/02/10 02:35 PM 02/02/10 02:35 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	Quote: Well, we have 3 different locations listed but three cars which people have stated are original tach cars have them in the same spot as the pic of the '70 GTX, so that location is in the lead so far! Thanks guys; if anyone has any more info or pics; lets see 'em! the holesaw is coming out in the next couple of days! Dave Add another.. Coded for tach... 5777055-firewall.jpg (555 downloads)

Re: 70 B body tach hole [Re: 1_WILD_RT] #599039 02/02/10 02:56 PM 02/02/10 02:56 PM
Joined: Jan 2003 Posts: 17,518 Las Vegas, NV 6bblgt I Live Here
6bblgt I Live Here Joined: Jan 2003 Posts: 17,518 Las Vegas, NV	Here's my February '70 LA built GTX - original tach hole. 5777089-1970GTXtachhole.JPG (1409 downloads)

Re: 70 B body tach hole [Re: 6bblgt] #599040 02/02/10 03:01 PM 02/02/10 03:01 PM
Joined: Jan 2004 Posts: 27,347 Today? Who Knows? 1_WILD_RT Management Trainee
1_WILD_RT Management Trainee Joined: Jan 2004 Posts: 27,347 Today? Who Knows?	The evidence is mounting...

Re: 70 B body tach hole [Re: 1_WILD_RT] #599041 02/02/10 04:30 PM 02/02/10 04:30 PM
Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada D DPelletier OP I Live Here
DPelletier OP I Live Here D Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada	Yeah, I agree: I'm just about ready to declare a winner! Thank you to everyone who posted! Dave 1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]

Re: 70 B body tach hole [Re: DPelletier] #599042 02/02/10 07:57 PM 02/02/10 07:57 PM
Joined: Jan 2003 Posts: 2,322 S sixbbl69 top fuel
sixbbl69 top fuel S Joined: Jan 2003 Posts: 2,322	tach hole diameter 13/16"

Re: 70 B body tach hole [Re: sixbbl69] #599043 02/02/10 08:01 PM 02/02/10 08:01 PM
Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada D DPelletier OP I Live Here
DPelletier OP I Live Here D Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada	Thank you. Dave 1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]

Re: 70 B body tach hole [Re: DPelletier] #599044 05/12/10 01:05 PM 05/12/10 01:05 PM
Joined: Dec 2009 Posts: 108 Ohio 7 70BIRD member
70BIRD member 7 Joined: Dec 2009 Posts: 108 Ohio	This thread came to mind as I'm installing the wiring in my car...I have a factory tach (70RR) and and I have the hole between the bulkhead and the master cylinder as shown in some of the pics above so that's no problem. What I'm confused about is in the new dash harness I have there are the black (w/red tracer)and blue (w/yellow tracer) wires that are fed thru a large conical shaped rubber grommet that someone above states is for the headlamps on a 70 Charger. So on my car are these wires are just left to hang under the dash unused? Thanks, Paul

Re: 70 B body tach hole [Re: 70BIRD] #599045 05/12/10 05:45 PM 05/12/10 05:45 PM
Joined: Dec 2003 Posts: 3,524 Lansing, MI 70gtx440dana master
70gtx440dana master Joined: Dec 2003 Posts: 3,524 Lansing, MI	These wires are for 70 Charger only. They run the headlight motor to open the doors. You will not need them on a RR. New harness must be generic. I would tape up the connector and even possibly tape this entire pigtail to your harness under dash. 70 Road Runner 383-4 4 speed FJ5 & black guts 70 Charger R/T 440-4 4 speed FJ5 & white guts

Re: 70 B body tach hole [Re: 70gtx440dana] #599046 05/12/10 05:59 PM 05/12/10 05:59 PM
Joined: Nov 2003 Posts: 6,519 Buffalo, NY U.S.A. MrNormsTA master
MrNormsTA master Joined: Nov 2003 Posts: 6,519 Buffalo, NY U.S.A.	When adding a tach on a non tach car, I would always drill a small hole in one of the extra spots on one of the bulk head connectors and pass a wire thru. I really didn't care about the hole, but figured some purist might not like it down the road, so why do it.

Re: 70 B body tach hole [Re: DPelletier] #599047 05/12/10 06:17 PM 05/12/10 06:17 PM
Joined: Nov 2009 Posts: 579 Ft.Myers,Florida Hemiruss mopar
Hemiruss mopar Joined: Nov 2009 Posts: 579 Ft.Myers,Florida	Dave the problem is your car is metric and is in the other side,It's a Canadian Thind..........lol lol lol...I thought you'd get a kick out of it from our past post exchanges......lolololololllool Russ....it's the big one in the middle.... 5978897-100_1474.JPG (326 downloads) Last edited by Hemiruss; 05/12/10 06:17 PM.

Re: 70 B body tach hole [Re: MrNormsTA] #599048 05/12/10 06:27 PM 05/12/10 06:27 PM
Joined: Oct 2006 Posts: 3,054 USA B b54406barrel master
b54406barrel master B Joined: Oct 2006 Posts: 3,054 USA	Quote: I really didn't care about the hole, but figured some purist might not like it down the road, so why do it. Years ago I had a wrecked 69 Charger dash & put the tach/clock in my 6bbl rr as it didn't have either. Once I found out how crappy (this was in the 70's) it was & hard to read, I took it out. Glad I didn't drill that hole!

Re: 70 B body tach hole [Re: 70gtx440dana] #599049 05/12/10 09:11 PM 05/12/10 09:11 PM
Joined: Dec 2009 Posts: 108 Ohio 7 70BIRD member
70BIRD member 7 Joined: Dec 2009 Posts: 108 Ohio	Quote: These wires are for 70 Charger only. They run the headlight motor to open the doors. You will not need them on a RR. New harness must be generic. I would tape up the connector and even possibly tape this entire pigtail to your harness under dash. I got the harness from Year One a few months ago and it was listed for 1970 Dodge and Plymouth models with oil gauge and I think it was made by M & H. In any event I'll tape up the connector and move on. Thanks for the response.

Re: 70 B body tach hole [Re: sixbbl69] #599050 05/13/10 12:41 AM 05/13/10 12:41 AM
Joined: Apr 2003 Posts: 380 Mesa, Az G GETX enthusiast
GETX enthusiast G Joined: Apr 2003 Posts: 380 Mesa, Az	Quote: tach hole diameter 13/16"

Re: 70 B body tach hole [Re: 6bblgt] #599051 05/13/10 09:32 PM 05/13/10 09:32 PM
Joined: Apr 2003 Posts: 470 old New Jersey P papajohn super street
papajohn super street P Joined: Apr 2003 Posts: 470 old New Jersey	Quote: Here's my February '70 LA built GTX - original tach hole. Same as my Feb. '70 LA built Road Runner! 5981372-70FJ6Tachhole.JPG (308 downloads)

Re: 70 B body tach hole [Re: papajohn] #599052 07/06/11 08:06 PM 07/06/11 08:06 PM
Joined: Aug 2003 Posts: 8,828 Houston, Tx hemi68charger master
hemi68charger master Joined: Aug 2003 Posts: 8,828 Houston, Tx	I believe the tach grommet was feed through the hole punch above the bulkhead connector when the car was equipped with cruise control. I believe the grommet for the cruise utilized the "normal" tach positon. As you can see on this '69 Charger R/T equipped with cruise, you can vaguely make out the single-lead tach wire harness out of the top position. 6717116-dual_snorkel_aircleaner_cruise.jpg (406 downloads) Troy Houston Mopar Connection Club '69 Charger Daytona 440 - auto - 4.10 Dana (now with 426 hemi) '69 Charger 500 440 - 4speed - 3.54 Dana '70 Road Runner 383 - 4speed - a/c (now with 440)

Re: 70 B body tach hole [Re: hemi68charger] #599053 07/06/11 08:14 PM 07/06/11 08:14 PM
Joined: Aug 2003 Posts: 8,828 Houston, Tx hemi68charger master
hemi68charger master Joined: Aug 2003 Posts: 8,828 Houston, Tx	Also, as was mentioned, '70 Charger headlamp harness would have been passed through the upper hole. The tach wire harness would have come out just like the B-bodies of '68-'69, the driver's side of the bulkhead connector.. Here's a picture of the firewall of my former '70 six pack Charger R/T without the tach option. The headlamp harness grommet came out above the bulkhead connector.. 6717135-100_9452.JPG (227 downloads) Last edited by hemi68charger; 07/06/11 08:14 PM. Troy Houston Mopar Connection Club '69 Charger Daytona 440 - auto - 4.10 Dana (now with 426 hemi) '69 Charger 500 440 - 4speed - 3.54 Dana '70 Road Runner 383 - 4speed - a/c (now with 440)

Re: 70 B body tach hole [Re: hemi68charger] #599054 07/06/11 08:15 PM 07/06/11 08:15 PM
Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada D DPelletier OP I Live Here
DPelletier OP I Live Here D Joined: Apr 2005 Posts: 15,134 Kelowna, B.C. Canada	Could be; I thought it might be a Charger thing..... In any case I'm 99% sure that a non-cruise Superbee should have it in the lower spot across from the wiring block. Dave 1970 Super Bee 440 Six Pack 1974 'Cuda 2008 Ram 3500 Diesel 2006 Ram 3500 Diesel 2004.5 Ram 2500 Diesel 2003 Ram 3500 Diesel 2006 Durango Limited [url] http://1970superbee.piczo.com [/url]

Re: 70 B body tach hole [Re: DPelletier] #599055 07/06/11 08:41 PM 07/06/11 08:41 PM
Joined: Aug 2003 Posts: 8,828 Houston, Tx hemi68charger master
hemi68charger master Joined: Aug 2003 Posts: 8,828 Houston, Tx	Quote: Could be; I thought it might be a Charger thing..... In any case I'm 99% sure that a non-cruise Superbee should have it in the lower spot across from the wiring block. Dave Dave, If you're referring to the position between the bulkhead connector and the booster/master-cylinder like in papajohn's picture above, you are correct....... Troy Last edited by hemi68charger; 07/06/11 08:42 PM. Troy Houston Mopar Connection Club '69 Charger Daytona 440 - auto - 4.10 Dana (now with 426 hemi) '69 Charger 500 440 - 4speed - 3.54 Dana '70 Road Runner 383 - 4speed - a/c (now with 440)

Re: 70 B body tach hole [Re: 70gtx440dana] #1817673 05/03/15 01:35 PM 05/03/15 01:35 PM
Joined: Feb 2003 Posts: 16,150 Mesa, Arizona D dart4forte I Live Here
dart4forte I Live Here D Joined: Feb 2003 Posts: 16,150 Mesa, Arizona	Originally Posted By 70gtx440dana Here is a picture....not sure on the size! That's about where my tach wire comes out on my GTS “So if it’s on the internet it must be true” Abe Lincoln

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