I’ve discovered my Tach is not correctly metering the time. It is about 60% of my Hobbs time. I also recently flew one flight to verify, flying at 2300 RPM, so my time on my watch and the tach time should be identical. And I still was getting about 60% compared to the Hobbs.
Is there a repair process, or is it just more practical to buy a new Mitchell mechanical Tach? Other suggestions?
Thanks!