What would a wiring diagram for that look like?
This is what it would look like. You will have to use two automotive relays because of how the start system works in this car. The start command uses a 5V reference and not a 12V. Also the start command is looking for a resistor around 1.3K-1.8K in my experience. I used a 1.5K without any issues so far. Your car may be different???? The resistor is found inside of the black switch and the end of the key switch unit. The pinout referenced here are the on the connector (see photo) on the black key switch.
The ACC and the IGN/RUN will be toggle (latching) switches while the START will be a momentary push switch. To start the car, one needs to turn on the ACC and the IGN/RUN switches (I don't believe the ACC has to be on in order for it to start). The engine will or will not start according to the safety circuits of the clutch/shifter, etc.
I have not actually wired it up this way and there is always that possibility of something not as one might think, but I have successfully wired up my more advanced system using the same diagram and understanding and it's working fine.
VATS will still have to be dealt with, either by disabling it using HP tuners or keeping the key inside the black ring and taping it up under the dash. I understand certain controllers cannot have VATS disabled such as the E69, but my P12 can.
Hope this helps.
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