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Oh I see. I was not the one running the tests, but the person running them said the engine was running a minimum of 1.5 hobbs (this was about a month ago so memory fades). If the case be that he did leave the master on for some time, 1.5 on the hobbs should still yield some time on the tach correct?

Yes, hobbs was 1.3 and tach was 1.1 Every flight has been accurate since.

Please explain why I would need an overhaul. The tach still works when flying, or higher rpm I should say.

I'm not sure how the hobbs is wired, but I don't think the hobbs is the issue. I'm mainly concerned about how the tach functions on the ground.

Is it possible for the tach to not work at say 1000 rpm or less but still function correctly at it's calibrated "one hour" rpm setting?

A plane that I fly for aerial surveying recently had new camera equipment installed, and to test the equipment the engine was running while on the ground. There was testing going on for about 2 weeks. Afterwards, the tach time still lined up with the ending time from the previous flight, but the...