Quote Originally Posted by SubGothius View Post
D'oh! I just realized the safety switch already effectively IS a relay, just controlled by oil pressure rather than another circuit. So you can just run a wire from the battery (+) terminal directly to the switch I terminal, and wire the switch P terminal to the choke and pump. You don't even need switched ignition power, because the safety switch would only send power to the pump and choke when starting or when the engine is already running, and cuts power when the engine stops running.
You are awesome, thank you so much for your help. This sounds like something my peanut brain can handle doing. I hope everything goes okay. My friend will have the fire extinguisher ready, just in case.