One of the local drag racers has a 160F temp. sensor installed in the fins of his radiator so it will turn on and off the water pump at 160F, I'm not sure if he has it wired into the ignition switch or not
He does commercial appliance repair here in Bend so he may have it set up so he can turn it on with the ignition switch on and have it turn itself off with the ignition switch turned off, I can ask him if you want to know