Msd Tach Adapter Wiring Diagram. Diode for msd box 9 images hooking up msd on lh 2 2 turbobricks forums msd hvc 6600 wiring diagram. Black connect to the negative battery terminal.
Figure 1 wiring the tach adapter. 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. For more information on tachometers and msd tach adapters see the tachometer section on page 16.
The wiring for the coil terminal shows the same in the 87 and 88 wiring diagram just on 87 cars only the internal white center wire of the shielded wire for the tach signal back to the ecu is connected at the ring terminal where you see it not wrapped up in the harness where you cant and you only see that blue wire with the white stripe that jumps over to the ignitor but.
Next use 16g wire and link all the coil side cut halves together and hook to the red wire with a green stripe of the 9117 tachometer adapter. Never connect any wires to the coil terminals when an msd 6 7 8 or 10 series ignition is installed. Violet connect to the trigger input wire of the tachometer. Next use 16g wire and link all the coil side cut halves together and hook to the red wire with a green stripe of the 9117 tachometer adapter.