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RPMs fluctuating wildly

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Joined
Mar 5, 2019
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Hi there. I have a Twin Comanche. The left engine RPM needle swings from 2000 to 2600 RPMs. Big wild swings. However, no change in fuel flow or MP indication. And no apparent difference in prop or engine sounds.

I am thinking we have a problem with the gears on the tach generator on the engine side or a cable that needs lubrication or a gauge issue.. What do you all think?
 

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