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A mechanical tach will register 1 engine hour for every 100,000 revolutions. At 1666.6 rpm it will register 1 hour for every hour run. At 800 rpm it will take two hours of run time to register an hour.

In my opinion this was a more accurate method of measuring engine wear but is rarely used any more.


10 hours on the tach means your piston went up and down 1 million times.

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12y ago

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