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[T3] how's it work?


Hey all.

I got a general knowledge sorta question here,  regarding engine RPM:
A tach gives a reading based on pulses thru an SP wire... "But", I say to 
myself, "the plug only fires every OTHER revolution."
So is my tach telling me distributor RPM, and the crank is actually spinning 
twice as fast?  

Wonder why I've never thought about this before...

--timmy
'72 square
'69 square
Jax, FL

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