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Old 10-30-2007
groundhog groundhog is offline
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I just used one of the handhelds on my diesel this weekend.
Not sure if this is right, but I put a little piece of the reflective tape (comes with the handheld) on the flywheel.

If I had the monitor too close, I got some funny high readings. I think that is because I was getting too much reflection from the non-tape metal area of the flywheel. So I backed off about to 6-8 inches off and got good readings.

The weekend before I used an oscilloscope and a piezo thingy. You flick the piezo thing with your finger and it makes a blip on the scope. I put a tape flap on the flywheel and let it hit the piezo thing every time it went around.

Also measured the drive shaft RPMs to to calculate my gear ratio.

groundhog
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