If you are using the magnetic pickup input (green and violet wires) to trigger your MSD ignition, you will need the Tach Adapter. The Tach Adapter will correct the operation of most voltage triggered tachometers that do not work directly off the tach output terminal of the MSD Control. This Adapter should also be used on current triggered tachs (hooked in series with the ignition switch).
Special Order. Generally Ships in 2-4 Weeks.
