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Hey all. Tried to submit this the other day, it didn't seem to show up. So here I am trying again. 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 spinning twice as fast? Or is the tach smart enough to divide by 2, thus telling me how fast my actual reciprocating mass is actually reciprocating? Wonder why I've never thought about this before... --timmy '72 square '69 square Jax, FL ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/