Here the ignition wires get shorted. I actually installed a switch relay in this circuit for two purposes.

1st - the clutch pedal has a sensor connector on it that makes you push the clutch in to start the car. Since mine was a conversion, this sensor on the clutch was not hooked up so my car can be started without pushing the clutch in... I installed the relay switch in the circuit of these two wires so that I'd have to press the relay to start my car. This was done for safety.

2nd - I did it mainly for theft protection. The hardest part is finding a really good spot to hide the relay.