Quote:
Originally Posted by Josh@STILLEN
I'm not sure if the tachometer is reading via the crankshaft position sensor, or what it's driven off of, but I do believe it would be measuring one rotation of the crankshaft (or flywheel) and noting that as a revolution.. not cutting it in half for each firing.
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I believe that the ECU gets its tach signal off of the flywheel, and uses the cam sensors to determine which cycle a given cylinder is in.