Ok, I went and messed with it today and I remembered that when I replaced my head gasket I broke a wire that went to the intake plenum. At the time I thought that the wire was a ground, so I just bolted the bare wire back on to the plenum. I disconnected that wire today, and the gauge showed nothing. So i'm thinking now that the wire is not a ground (obviously), and that I need to find the connector on a junker and splice it in. What do you think, will that work if i just splice it in with a little crimp connector and some electrical tape?

1988 Trooper II in the works.