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FAQ ANSWER DETAIL
Chrysler / Mopar Orange and Chrome Box Ignitions
If you have a Mopar Orange or Chrome Box ignition system on your vehicle, rather than connecting the Green signal wire of your tachometer to the negative side of your ignition coil, instead locate the Gray wire running between the Ignition Box and the Distributor. Connect your tach's Green signal wire to this Gray wire for a proper engine RPM signal.