Any of the fuel injected Chevy V-8's will have a 3-pole pressure switch that mounts in a threaded port just above the oil filter. Two of the terminals are the normally-open fuel pump switch leads, and the third one is a ground for the oil pressure idiot light. You can use just the N.O. terminals to connect a straight battery voltage source to the choke(s), and it interrupts the circuit anytime the engine stops. Safe, positive, and it doesn't need to go through the ignition switch. I would reccomend using an inline fuse of about 20 amps on the hot side, just to guard against a short circuit anywhere.
Jerry

Edit: Forget about the rated current capacity. I've used those switches to carry 15 to 20 amps without any problems! They're way over-engineered!
Jerry

Edit X2: The turn-on pressure is about 7 lbs. It's the same as the pressure necessary to turn off the idiot light for low oil pressure.
Jerry


Last edited by Hotrod Lincoln; 09/04/2008 8:43 PM.
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