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Brad
I suppose I'm one of the 'tach boys' who does not have the answer but maybe something here to ponder. Don't know much about the meter movement and mechanical dampers, the speedo shop must know what they're talking about if they say they break. The meters have something to mechanically slow the response of the needle to make it react smoothly, and average-out the noise and jitter coming into it. That said, I noticed that mine would do some really odd things when I didn't put a signal into it that it liked. I could get some overshoot by quickly changing the frequency, and I can do that faster than a real engine can with a signal generator. What I'm wondering is - assuming you've got it hooked up to a stock ignition - could this be caused by a bad part in the ignition? Specifically a bad condensor or coil causing too much ringing which sends some abnormal garbage at the tach?
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