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i looked at my wiring diagram, and i didnt find the right color coming from my ignition coil so i went down the parts store, bought a few feet of 18 gauge primary wire and just hooked it up from the ignition coil straight to my dash. i'm idling at about 1-1.4 x 1000 rpm though. i believe my car (78 245) should be idling around 900. but i was suspecting that. it's one of the reasons i thought i needed a tach.
i still havent received the other gauges though so ill see how i manage those once they come in.
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