Thread: Engine RPM
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Old 10-13-2014, 04:30 PM
J-Mech J-Mech is offline
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Join Date: Apr 2013
Location: Oblong, Illinois
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A photo-tach is the most accurate. You can also use a multi-meter with an RPM function, or a timing light with a RPM function. I have all 3, but I own a shop too.
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