Quote:
Originally Posted by JimsCAL
Getting a reliable reading with an optical tach is not as easy as it first appears. Any difference in reflectivity can produce a "pulse" and through off the reading. Make sure the reflective tape is on a clear are of the pulley and move the sensor in and out until you get a steady reading.
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I moved the optical tach around a bit and only observed changes in the 10% range.
If this is really the crankshaft and if I can believe the optical tach ... I have a very fast idle!