How to connect the white wire.
The white wire is for throttle reference. It can be connected at the pedal as I have shown above or at the ECU.
To connect to the ECU slide the yellow tab up on the lower connector plug, and pull the lever away to release the plug.
Remove the insulation to reveal the wiring, there are several Purple/black wires, make sure you can get at them with a needle for testing the voltage in the next step.
You now need a multi-meter to read DC voltage up to 12v, some will show upto 20volts this scale is fine.
You need a needle on the red wire from the multi-meter, (I find this easiest for stabbing the insulation and causes minimal damage) Put the black wire from the multi-meter to ground ie chassis or negative on the battery terminal.
Now reconnect the ECU plug making sure you can still locate the Purple/black wires.
Put your key in the ignition, but don't start the car.
Have someone opperate the throttle while you stab the purple/black wires, one will be showing around 1 volt with no throttle and it will rise with the throttle pushed to approx 4volts, this is the wire you need to connect your white wire to.
Remove your ignition key and remove the lower plug and either solder/crimp to that wire.