Ok, I guess I have to be the one who says it. Get rid of that old antiquated, inaccurate system and install an accurate electronic system. Once you do it you'll never look back. Oh, and you will actually know what your engine is doing.
Keep in mind a recording tach is not a clock, it is a revolutions counter. The number of revolutions an engine makes is more indicative to the amount of wear than the hours. A hobbs counts full hours from the time the oil pressure comes up or the master switch is turned on.I use a hobbs installed in the panel but maybe it's time to bite the bullet and just get an electric recording tach.
Mike Watson
Keep in mind a recording tach is not a clock, it is a revolutions counter. The number of revolutions an engine makes is more indicative to the amount of wear than the hours. A hobbs counts full hours from the time the oil pressure comes up or the master switch is turned on.
If you are an FBO renting out your airplane you "sell" the time by the hobbs, but you do your 100 hour inspections by the recording tach. Any maintenance which may be required at a specific number of hours will come up more often with a hobbs keeping track of the time than it will with a recording tach. More $$$ sooner.