Ok i think ive figured out how to check for continuity. I use my dvom and connect the leads to the +5v supply on connector 2 of the pcm with the tranny fuse disconnected and the other lead of the dvom to the negative terminal of the battery.Right! Oh and i could never get to the 8-way tranny connector. There is a bunch of gunk where you said the connector is and i cant see it at all. Im not that familiar with my truck lol. On the gps itself, do you know the ohms that it would be if it was good? Im sure i can use my dvom to make sure its good.