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1036  Forum 2005-2010 (read only) / Bar Sport / Re: detecting RPM by wrapping a spark plug wire on: November 30, 2008, 06:42:45 pm
Also check TinyTach ( http://www.tinytach.com/tinytach/index.php ) for prebuilt tachometers that work the same way.  I know several folks who use these on scooters (1 cylinder, 4 stroke, lost spark) but they have other cylinder/stroke arrangements available.
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