Shatar, sorry, I carry those in my head..lol. Between the relay(s), wire, and switches, I think the "system" costs about $50. You basically end up wiring the switched side of the relay so the ground side is one side of the 3-way, and the sensor on the engine is the ground on the other side. My toggles are open (not on) in the center position. It means much les wiring going back and forth, even to the relays. I could try and sketch one... but no promises on how good it might be to read...lol.
