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