HMMWV engine RPM sensor

From: mblair1@home.net
Date: Mon Jul 03 2000 - 15:56:00 PDT

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I'd like to be able to make a gizmo that I can connect to a HMMWV's
STE/ICE connector to measure the engine RPM using the sensor installed
at the back of the engine block. A quick experiment showed that the
sensor appears to contain a reed switch which opens and closes two
times per rotation of the sensor's shaft, but I don't know how the
sensor's connection to the crankshaft is geared.

Does anybody know how many times the switch opens and closes per
engine revolution?

Thanks in advance!

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Mark J. Blair, KE6MYK <mblair1@home.net>
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