Msd Tach Wiring

Some vehicles with factory tachometers may require a tach adapter to operate with the msd. The tach output wire produces a 12 volt square wave signal with a 20 duty cycle. The msd ignition features a gray tach output wire that provides a trigger signal for tachometers a shift light or other add on rpm activated devices.

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Run the white wire from the tachometer to the wiring for the instrument lights.

Msd tach wiring. For more information on tachometers and msd tach adapters see the tachometer section on page 6. Squeeze the metal tap on the connector down with a pair of pliers and snap the cover on the connector closed. Close the two halves of the connector around the white wire and the instrument light wire. Just a little video i made to help you understand the way a tachometer should be wired.

The tach output terminal produces a 12 volt square wave signal with a 20 duty cycle. Items you will need wire strippers 12 gauge automotive wire male and female connectors volt test light. The msd ignition features a tach output terminal on the side of the unit. The pn 8920 will correct the operation of most voltage triggered tachometers that do not work directly off the tach output terminal of the msd control.

Connect the white wire to this wire using a crimp on wire tap. Some vehicles with factory tachometers may require a tach adapter to operate with the msd. This terminal provides a trigger signal for tachometers a shift light or other add on rpm activated devices. Msd tach adapter pn 8920 if your tachometer doesn t work correctly after installing an msd ignition control always try to connect the tach s trigger wire directly to the tach output of the ignition.

The tach output terminal produces a 12 volt square wave signal with a 20 duty cycle. If the tach still registers incorrectly install this tach adapter. Https amzn to 2rirmf9 thanks for watching. If you are using the magnetic pickup input green and violet wires to trigger your msd ignition you will need the pn 8920 tach adapter.