10-10-2016, 06:21 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
It almost has to be a bad ground path for the bulb in the gauge. Instead of the bulb having a nice, clean ground path back to the negative terminal of the battery, the electrons are taking a "short cut" across the workings of the tachometer, and the result is that the tachometer doesn't work. Try running a wire, with alligator clips on both ends, from the negative side of your battery and clamp it on a metal portion of the gauge (try a couple spots) and see if that temporarily fixes it. And if there's a nice loose ground wire running to the gauge, try jumpering to that as well. Sometimes the "jiggle" test is your best friend.
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