This is correct. The pressure switch is from napa and has 1/8" pipe threads (closed at about 5 psi, and open with no pressure. "T" it into the oil pressure connection. The mag cannot have any power to it it is grounded at the side terminal to make the tractor stop. If power was put to it it may nave at least burnt points if not toasted mag coil. The on off switch is a grounding kill switch.