I don't have a 1972 FSM but I'm alomst sure the pre 1971 and earliers cars used either a 16 or 14 gauge field wires I don't know what you call a sense wire, the early mechanical alternators fed the feild side of the alternators off of the distributor ballast resitor, the later cars with electronic voltage regulators use one wire from the ignition switch and the other one from the ignition circiut off of the ignition ballat resitor