What about some kind of crank trigger and magnetic pickup device to give you an "rpm" so to speak. It may not give a total and accurate RPM, but I would think it could be hooked to a gauge of some sort to give you feedback, even if the gauge says you are turning 8000 rpm at idle and 10,000 rpm at speed?
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Current MPG driver:
1994 Isuzu Rodeo - Beater with a Heater...
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