CJ7 Tach wiring - Pirate4x4.Com : 4x4 and Off-Road Forum
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Old 01-26-2008, 09:05 PM   #1 (permalink)
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CJ7 Tach wiring

I have an 83 CJ7 with the stock 258 I6 running a Howell TBI and the GM HEI distributor both of which eliminated tons of unnecessary wiring. My stock tach still operates but acts strangely. It seems close at idle but wont go above 3000 RPM. When I hit the throttle hard it dips momentarily. Now I'm aware of how most tachs are wired but this tach is different than any I've seen. It has two large red wires in the back, either of which, when cut, causes a loss of signal to the Howell system as evidenced by a loss of the check engine light and it will not run when the key is released after startup. I thought one would be a ground that I could simply hook to the tach lead on the HEI distributor but have found that this is not the case. I know most will say just add a separate tach but I am maintaining the original look and spirit of my ride while making all my upgrades in perfomance and running gear. If anyone else has dealt with this or has a wiring schematic and can help me figure how I might make this work I'd be mighty grateful. Thanks in advance.
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