There should be a small harness under the floor near the STE (diag) port (3 wires) the #36 is the oil pressure gauge and must be extended to the oil pressure sending unit on the rear of the left valve cover, #33 is the temp wire and must be extended to the temp sending unit near the front of the left head (under the alt), #58 is ground and should be extended to the engine block.
No idea why it will not shut off, do all the acc (heater blower, WW motor) turn off??
EDIT, I would be disconnecting the batteries (not while running) until I got this figured out.
ARE you positive you have the wires to the regulator connected correctly?