Re: 70 Cuda Rallye Dash Tach
[Re: Spraygoon]
#1084669
09/28/11 08:53 PM
09/28/11 08:53 PM
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Joined: Mar 2007
Posts: 3,277
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,277
West Coast, USA
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Redline installs modern internals.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: 70 Cuda Rallye Dash Tach
[Re: BDW]
#1084674
09/28/11 10:16 PM
09/28/11 10:16 PM
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Joined: Nov 2004
Posts: 81
Oklahoma City
Spraygoon
OP
member
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OP
member
Joined: Nov 2004
Posts: 81
Oklahoma City
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Quote:
Surprised anything at all works from the Tach Man.
Guy is a total nightmare, had to get everything he "fixed" redone.
Buyer beware, when someone refuses to accept credit cards because "people have reversed charges for no reason", there's probably good reason to steer clear!
Yes that did bother me a bit about the cards. So where did you get yours fixed? Thanks
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Re: 70 Cuda Rallye Dash Tach
[Re: Spraygoon]
#1084675
09/28/11 10:24 PM
09/28/11 10:24 PM
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Joined: May 2005
Posts: 4,723
Florida
BDW
master
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master
Joined: May 2005
Posts: 4,723
Florida
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APT fixed my speedo after he screwed it up twice. http://www.gaugeguys.com/My tach still doesn't work right, haven't tackled that yet. I'll probably do the RTE upgrade eventually.
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Re: 70 Cuda Rallye Dash Tach
[Re: Spraygoon]
#1084676
09/29/11 12:03 AM
09/29/11 12:03 AM
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Joined: Jan 2003
Posts: 5,439
So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,439
So Cal
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Quote:
So no one has successfully gotten one to work with a modern ignition or even if it did they still suck??, I wouldn't mind if the response time was slow, I would just like it to read within 200, I am pretty sure the guy I sent it to replaced the "board" but said he had no way to calibrate it or something like that. I had planned on using a shift light anyway, I have an autometer tach that will work a shift light and was just going to mount the tach under the dash or something as the light is on a wire that can be mounted off the tach. I had the tach mounted in front of the clock but I got the clock working so I hate to cover it up.
Problem is the OE tach responded to the pulses from the points distributor, quite different for being compatible with a transistor ignition..
The tach's internal circuit board needs updating..
I had RedLine Gauges update my ralley tach to be compatible.
Just my $0.02... 
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Re: 70 Cuda Rallye Dash Tach
[Re: Spraygoon]
#1084678
09/29/11 12:44 PM
09/29/11 12:44 PM
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Joined: Mar 2007
Posts: 3,277
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,277
West Coast, USA
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Quote:
So no one has successfully gotten one to work with a modern ignition or even if it did they still suck??, I wouldn't mind if the response time was slow, I would just like it to read within 200, I am pretty sure the guy I sent it to replaced the "board" but said he had no way to calibrate it or something like that. I had planned on using a shift light anyway, I have an autometer tach that will work a shift light and was just going to mount the tach under the dash or something as the light is on a wire that can be mounted off the tach. I had the tach mounted in front of the clock but I got the clock working so I hate to cover it up.
I had Redline put all new, modern tach internals in my Ralley dash. It's not just a circuit board patch kit. They use all completely new guts. It's fast, accurate and works as good as any new tach out there. It's an excellent way to go. I have MSD and it hooks right up with no adaptors.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: 70 Cuda Rallye Dash Tach
[Re: BDW]
#1084682
09/29/11 08:59 PM
09/29/11 08:59 PM
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Joined: Jun 2008
Posts: 1,822
Colorado
denfireguy
top fuel
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top fuel
Joined: Jun 2008
Posts: 1,822
Colorado
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Quote:
Other than than the circuit board, what other "internals" are there?
The stock tach consisted of a 2 transistor amplifier driving a meter movement (D'Arsonval moving coil). There were two wirewound resistor trim pots and a handful of large wattage resistors. In short, there was really no reason for it to be very accurate.
I did the RTE (now Dashworx) replacement and then I sent it to him to calibrate it. It is fairly close to my tune up tach. For years, I ran a Heathkit digital tach in the Cuda that was very accurate. The tach in the dash is an analog indicator of a digital signal. Meter ballistics will always delay the indication by several hundred milliseconds. A digital tach should be nearly instantaneous since it just needs to count pulses and divide by time.
Craig
2014 Ram 1500 Laramie, 73 Cuda
Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango
Only previous Non-Mopar: Schwinn Tornado
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Re: 70 Cuda Rallye Dash Tach
[Re: Sinitro]
#1084683
09/29/11 09:07 PM
09/29/11 09:07 PM
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Joined: Jun 2008
Posts: 1,822
Colorado
denfireguy
top fuel
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top fuel
Joined: Jun 2008
Posts: 1,822
Colorado
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Quote:
Problem is the OE tach responded to the pulses from the points distributor, quite different for being compatible with a transistor ignition..
The tach's internal circuit board needs updating..
I had RedLine Gauges update my ralley tach to be compatible.
Just my $0.02...
The pulse width of the stock electronic ignition was similar in duration to the breaker points ignition and the same voltage. The original factory tachs for each ignition system are identical and equally inaccurate.
2014 Ram 1500 Laramie, 73 Cuda
Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango
Only previous Non-Mopar: Schwinn Tornado
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Re: 70 Cuda Rallye Dash Tach
[Re: denfireguy]
#1084684
09/29/11 09:24 PM
09/29/11 09:24 PM
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Joined: Jan 2003
Posts: 5,439
So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,439
So Cal
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Quote:
Quote:
Problem is the OE tach responded to the pulses from the points distributor, quite different for being compatible with a transistor ignition..
The tach's internal circuit board needs updating..
I had RedLine Gauges update my ralley tach to be compatible.
Just my $0.02...
The pulse width of the stock electronic ignition was similar in duration to the breaker points ignition and the same voltage. The original factory tachs for each ignition system are identical and equally inaccurate.
Similar but not the same..
The OE tach will function with a transistor ignition but is highly inaccurate..
The pulses with the transistor ignition system are shorter and faster, thats why the OE tach is way off by 500-1k RPM.. The mechanical meter pointer is slower than a digital display but still the primary issue is pulse response time..
Just my $0.02..
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send it to Redline and get rid of all the stock internals. Did this to both of my cars 