MSD 8920 Tachometer / Fuel Injection Pickup

Magnetic Trigger Installations or Current Triggered Tachometers; If you are using the magnetic pickup input (green and violet wires) to reluctor your MSD Ignition, you will need the PN 8920 Tach Adapter. The PN 8920 will correct the operation of most voltage-reluctored tachometers that do not work directly off the tach output terminal of the MSD control. This Adapter should also be used on current-reluctored tachs (hooked in series with the ignition switch).;