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tach issue #145450 11/04/08 09:47 AM 11/04/08 09:47 AM
Joined: Apr 2007 Posts: 280 louisiana K kingkt OP enthusiast
kingkt OP enthusiast K Joined: Apr 2007 Posts: 280 louisiana	where on the firewall harness would the tach wire be located?

Re: tach issue [Re: kingkt] #145451 11/04/08 09:57 AM 11/04/08 09:57 AM
Joined: Dec 2007 Posts: 304 Ohio LS-300 enthusiast
LS-300 enthusiast Joined: Dec 2007 Posts: 304 Ohio	Depends on which car and year. 1979 Chrysler 300 1968 Barracuda project

Re: tach issue [Re: LS-300] #145452 11/04/08 10:05 AM 11/04/08 10:05 AM
Joined: Apr 2007 Posts: 280 louisiana K kingkt OP enthusiast
kingkt OP enthusiast K Joined: Apr 2007 Posts: 280 louisiana	its a 70 challenger r/t

Re: tach issue [Re: kingkt] #145453 11/04/08 01:53 PM 11/04/08 01:53 PM
Joined: Dec 2007 Posts: 304 Ohio LS-300 enthusiast
LS-300 enthusiast Joined: Dec 2007 Posts: 304 Ohio	Info I have states that the tach wire is seperate. It should be an 18ga gray wire with a tracer that goes thru a grommet in the firewall. This would be true for all engines except the Hemi. 1979 Chrysler 300 1968 Barracuda project

Re: tach issue [Re: LS-300] #145454 11/04/08 02:03 PM 11/04/08 02:03 PM
A Anonymous Unregistered
Anonymous Unregistered A	that how I thought it was too

Re: tach issue #145455 11/04/08 10:06 PM 11/04/08 10:06 PM
Joined: Dec 2007 Posts: 304 Ohio LS-300 enthusiast
LS-300 enthusiast Joined: Dec 2007 Posts: 304 Ohio	Looking at some old engineering drawings that I have. If the tach did go to the connector it would be in pin #20. 1979 Chrysler 300 1968 Barracuda project

Re: tach issue [Re: LS-300] #145456 11/05/08 11:02 PM 11/05/08 11:02 PM
Joined: Apr 2007 Posts: 280 louisiana K kingkt OP enthusiast
kingkt OP enthusiast K Joined: Apr 2007 Posts: 280 louisiana	thanx for the info, ill look into your suggestions. in the meantime, anyone know why the tach needle would go straight to the top when the key is on and after it starts?, ive removed the wires to the coil and the alt, and it does the same thing. thanx

Re: tach issue [Re: kingkt] #145457 11/05/08 11:10 PM 11/05/08 11:10 PM
A Anonymous Unregistered
Anonymous Unregistered A	sounds like you have the tach hooked up to 12v. better check it with a meter

Re: tach issue #145458 11/06/08 12:55 AM 11/06/08 12:55 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	you might jump the tach wire directly to the coil neg, start the eng & see if the tach itself is good. live every 24 hour block of time like it's your last day on earth

Re: tach issue [Re: RapidRobert] #145459 11/06/08 01:55 AM 11/06/08 01:55 AM
Joined: Apr 2007 Posts: 280 louisiana K kingkt OP enthusiast
kingkt OP enthusiast K Joined: Apr 2007 Posts: 280 louisiana	ill definetely try that, thanx. i notice that there is a pos and a neg wires connected to the alt gauge, and thats what seems to power up the complete dash cluster. anyone know if this is correct? appreciate all your help guys! this one has got me stumped

Re: tach issue [Re: kingkt] #145460 11/06/08 09:33 AM 11/06/08 09:33 AM
Joined: Apr 2008 Posts: 1,195 Snowing in the north! D Dart 340 moparts member
Dart 340 moparts member D Joined: Apr 2008 Posts: 1,195 Snowing in the north!	Yes, in a rallye dash like on my A body, the wires go directly to the amp gauge and basically power out from there.

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