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I am having a similar issue, My tach has never worked. Now the only gauges that work are the speedo, perfect pass, fuel gage, depth finder. I bought a new Black box ECU and put it and that didn't change anything. So my voltmeter, temp, and tach don't work. none of the gauges go through the cycle test when you first apply power either. You can hear (what i assume to be the servos) running like they would when the gauges go through the test but the needles don't really move. They may flicker. I haven't tried unplugging them one by one though.
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