Replacing Hour Meter's

I don't think it is possible to trick the AETNA tach into advancing without the engine pulse. I'm not doubting the tractor guy's ability, just questioning how he could figure this out. On a Cummins C, the tooth count is 127 pulses per engine revolution. To get the tach circuitry to function you would need to build a pulse generator to trick the Aetna into recording hours.

Too much sugar for a dime....or too many other more important boat jobs to tend to when proof of engine hours is a simple aas keepinh the old tachs with the boat to prove actual hours. You look at my dash and you see the tachs reading about 325 hours when the engine really have about 1600 hours on thm. I know the real TT and can get it in 5 seconds by adding the Aetna time to the time on the tachs that they replaced.
Fair enough. I was just curious if there was a simple process to run up the hours but it looks like there isn't. Funny part is my original tachs have 723 hours which is my mom's birthday, so very easy to remember and do the arithmetic going forward.
 
Fair enough. I was just curious if there was a simple process to run up the hours but it looks like there isn't. Funny part is my original tachs have 723 hours which is my mom's birthday, so very easy to remember and do the arithmetic going forward.

Apparently it's not an easy process, and thankfully (in this case) my wife's memory came in handy. I just wrote the hours on the "can" with black permanent marker. In your case since you're planning on reusing the old cans, you can just write on a piece of duct or masking tape. I figured if they didn't believe me, then they could power them up and check for themselves. Strange coincidence, but that was my Dad's birthday too.

-Tom
 

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