Quote:
Originally Posted by michael
My guess would be the drive gear for the speed sensor is about to fall off its axle. What ever holds it in place is gone or loose and it grabs randomly.
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Not a good guess as no drive gear or axle involved. The tacho in itself is probably the likely culprit. Hair spring, pointer bearing, obstruction within the movement.
Alternatively there could be a faulty connection in the operating circuit.