Here is the final install. I cheated a little bit on the wiring because I had never removed the power to the battery (was disconnected) and ground from a subwoofer amplifier that is no longer in the truck. That made two of the three connections really easy and the orange one I just piggy backed on the one for the tachometer that already shares with the stereo. It all seems to work great. I get a little noise with RPM, but I think it will be easily squelched when I'm within normal range of a signal.
