09-24-2009, 10:00 PM
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CC Member
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Join Date: Apr 2004
Location: Scotts Valley,
CA
Cobra Make, Engine: ERA 289 FIA #2108
Posts: 1,882
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Not Ranked
I am using a harness ground. Admittedly, when I first wired it six months ago I hadn't grounded it correctly (neg needs to be tied to ground). I think with the floating ground it may have damaged the circuitry and now reads incorrectly.
I've already purchased a new tach, so I'll put that in, test it. I'll check the ground again in the process, as well as the +12V. Beyond that, I guess I may be playing with better shielded spark plug wires...
DD
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Dangerous Doug
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