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Old 06-16-2019, 06:50 PM   #3
chap52
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Join Date: Jun 2013
Location: Marana Arizona
Posts: 1,466
Default Re: Calculating engine RPM at idle

I have one of these $20 from Amazon digital Tachometer and it works great. Comes with a case and lots of reflective tape. Just put a small piece of the tape on the front pulley and point the red laser at the tape...
Only oops I found is that it is best to unplug the 9vt. battery between uses. Chap


https://www.amazon.com/Digital-Photo...gateway&sr=8-3
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