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You'll notice the bump at the 100 mark. Hold your finger tip or thumb over it to count how many revolutions the dial makes. Use that number to get your final rpm.

I used to repair those at Ford, but never got one myself. Handy tool for the quick check on motor rpms.
 
Discussion starter · #22 ·
You'll notice the bump at the 100 mark. Hold your finger tip or thumb over it to count how many revolutions the dial makes. Use that number to get your final rpm.

I used to repair those at Ford, but never got one myself. Handy tool for the quick check on motor rpms.
Mike,

Would you be interested in this one?

Thanks for the information.

David
 
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