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Original Comment:

Fluctuating RPM indication

I installed an electric tachometer from Jeff Pearson a couple of years ago, and it has been working perfectly until recently. It has now begun to regularly, but not consistently, fluctuate +/- a couple of hundred RPM at any power setting, and is slow to reach an accurate RPM indication on start-up. I initially suspected a loose tachometer drive cable, but both ends were secure. I then removed the cable from the 90-degree drive on the engine and spun the inner drive cable with a drill motor, and the indication on the tachometer was steady. I then suspected the 90-degree drive on the engine might be slipping, so I removed it, checked the mating connection on the engine (all appeared well), and installed a new 90-degree drive unit. The problem is still there. Has anybody had similar issues with the electric tachometers? Is it likely that the drive gears on the engine are loose/slipping somehow? Any and all advise will be, as always, sincerely appreciated.

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