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Registered
Join Date: Sep 2000
Location: Hopkinsville, KY,USA
Posts: 90
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compufire - tach does not work
I installed a Compufire module and now my factory tach does not work. I tried another factory tach that I had and it does not work either. I hooked up an aftermarket Sun tach and it works. As far as I know, both tachs work. Any clues?
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08-25-2003, 06:32 AM
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Registered
Join Date: Dec 1969
Location: chula vista ca usa
Posts: 5,700
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When you hooked up the Sun tach, was it at the connections at the dash or at the coil? The tach is fed by the black & purple wire at the coil so you will need to make sure the wire to spade lug connection is good and on the correct coil terminal. We have a Compufire module on our 1974 had have never had tach problems with it. Good luck
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08-25-2003, 10:26 AM
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Registered
Join Date: Sep 2000
Location: Hopkinsville, KY,USA
Posts: 90
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Using the same wiring point at the dash. I have taken a tach and hooked up directly at the coil to try it there. Maybe I just had bad luck with 2 tachs at one time and need to get them checked.
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08-25-2003, 11:21 AM
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Registered
Join Date: Dec 1969
Location: Chicago, IL, USA
Posts: 101
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I ran into the same problem when I installed my Crane XR-700 unit (I know that it's not the same unit). Couldn't even get an rpm reading with my dwell/tach meter, which worked fine with the standard points/condesor setup and on my wife's minivan.
Wish that I could be more helpful, but after following the Crane tech support tips, my tach still wasn't working. Eventually, i jazzed up the shutter disc and put the points/condensor back in until I have more time to find a solution. You may want to contact the tech support people at Compufire to see if they can give you some suggestions. I know that Crane sells a tach adapter device which can be used when all else fails. If you run out of other options, Compufire may have a similar "solution" Best of luck. Howard
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1974 914 2.0 "pearl" white Every so often, I even get to drive it! |
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08-25-2003, 06:58 PM
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Registered
Join Date: Jun 2001
Location: Central Florida
Posts: 1,409
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The older tachs tend to not like the type of signal from the newer electronic ignitions.
Solutions are 1. To get a tach amplifier 2. Replace the internals on your tach to accept the new signal from the newer ignition. (this is what I did on my gauges) 3. Get an adapter to convert the new signal to the older type signal. Call Compufire and see what they say.
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Qarl |
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08-25-2003, 07:43 PM
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