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post #2 of Old 12-24-2009
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Never heard of it, but it sounds like it should work.

Most diesel tachs work in one of two ways: Counting pulses from the alternator, or counting pulses from the teeth on a gear ring on the camshaft. So, pulses is pulses and this one is counting pulses from the fuel injectors.

Should work just as well, clever idea.

You probably an get a used Yanmar gauge from Sailorman (Ft. Laud) or some of the other "used boat parts" places, with a little patience. Then it is just a question of whether you need a sender, or a connection to the alternator, and you probably can fix up the original system too.
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