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RPM unstable
Tach reading in the 4500 has become very unstable, fluctuating wildly and randomly, and pegs at 3000 for much of the time. The analog tach remains stable and true. I assume that this is more likely to be a faulty sensor (AFS/magneto) than an EFIS problem, and ask whether replacing that would be a logical next step.
Kenneth Melvin
RV-9A, Hillsboro.
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