Msd Tach Wiring
Some vehicles with factory tachometers may require a tach adapter to operate with the msd.
Msd tach wiring. If the tach still registers incorrectly install this tach adapter. Run the white wire from the tachometer to the wiring for the instrument lights. Some vehicles with factory tachometers may require a tach adapter to operate with the msd. 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.
Https amzn to 2rirmf9 thanks for watching. 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. The tach output terminal produces a 12 volt square wave signal with a 20 duty cycle. 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.
Just a little video i made to help you understand the way a tachometer should be wired. This terminal provides a trigger signal for tachometers a shift light or other add on rpm activated devices. 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. 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. Connect the white wire to this wire using a crimp on wire tap. The msd ignition features a tach output terminal on the side of the unit. Close the two halves of the connector around the white wire and the instrument light wire.