Msd Tachometer Wiring Diagram. Some vehicles with factory tachometers may require a tach. Connecting to the ignition coil or msd 6 1.
Black connect to the negative battery terminal. Tachometers 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 msd ignition features a tach output terminal on the side of the unit.
Shielded cable 1 posi lock connector tach signal shielded cable 2 posi lock connector tach power diagram j wiring from the tachometer to the ignition coil or msd 6 described on page 4 in the text and in diagram g.
We drill a new hole and run the wires through the firewall below the starter solenoid. Combine the black and uninsulated wires which will be used for the ground into a 5 16 ring terminal. Msd wiring diagrams tech notes. The tach output terminal produces a 12 volt square wave signal with a 20 duty cycle.