Where can I hook up an electric choke?

replicaracer43 said
Get a three prong oil pressure sending unit from your local NAPA store, run a fused 12v feed off the the battery or at the heavy lug on the starter solenoid to one of the the "normally open" lugs on the sending unit. Run a wire from the other "normally open" lug directly to the choke. Easy, safe, and unlike the other methods, leaving the key on wont open the choke...

Ok I like the idea of the oil sender connecting the circuit for the electric choke because the engine runs before the choke gets power but doesn't the oil sending unit only have 5 volts going to it normally? Also what year make and model sending unit do you ask for