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The RPM transducer needs an RPM signal, which it gets from the distributor via the wire going to the tachometer.
I did the potentiometer trick when I rebuilt my RPM transducer circuit. Each unit is hand tuned from the factory so I put in a Zener diode and a couple new transistors and then dialed in the RPM I wanted it to function in. Then I went and soldered in the closest 2 resistors to that ohm value.
Sorry I cannot help with the tach issue. I am running the stock Bosch CDI, distributor, and black coil.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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