Old tachs that hook up to the negative of the ignition coil typically rely on a flyback voltage spike from the coil's inductive load being interrupted to trigger a tach pulse. By using the coil from a relay and some schematics found on the google, I was able to simulate this effect and hook my Speeduino ECM up to the stock tach.
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Tach Adaptor Using Relay (Speeduino to 70's Tachometer)
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