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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Tachometer Operation/Waveforms
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Sun, 04 September 2005 00:49
 
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Wilbo,
in most cases (in fact, all) where electronic ignition is being used, the tachometer is in fact driven by the "tacho" output of the ignitor.
Do some reading on an LM2917 IC - these are essentially what's being used in your tachometer to make the needle move.
I havent messed around enough with measuring the actual waveforms to work it out for sure.... BUT - i do have a nifty little mod to the tacho itself that "should" make it work. Requires about 80c worth of parts from Jaycar 
Email - thewitzl AT optusnet DOT com DOT au
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