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    TACH ADAPTER, WHICH WIRE TO COIL HARNESS, HELP!!!!!!!

    JUST INSTALLED A MSD TACH ADAPTER IN A 04 COBRA FOR A NEW TACH. WHICH WIRE DO I HOOK INTO THE COIL HARNESS TO GET THE RPM'S. I SEE ALL THE WIRES ARE NUMBERED BUT DO NOT KNOW WHICH THICK RED WIRE TO TAP INTO. THANKS TO ALL WHO HELP.:hail2: