the connection to a standard oil idiot switch is a ground switch.
Are you suggesting adding a different type of pressure switch, one that is a true switch on with positive power?
3-prong oil pressure switch, one prong like original to drive a dash indicator light, two as a "pass-through" (normally open) but when oil pressure closes the switch, the choke gets power.
Right now I am adding an electric choke, how much current flows thru that heater? If it is not much, can you take power from the coil ignition switch?
You should not take power from the ignition coil if the coil has a ballast resistor. You could take power from an HEI power wire as the HEI uses battery voltage and a heavy power wire that can supply plenty of current.
Some folks suggest taking power from the windshield wiper motor; as it isn't powered during cranking, and doesn't have a ballast resistor in the circuit.
First Guess: The electric choke takes very little power.
