Thanks! I scrolled through that section of the FSM until I found the results that I was looking for. Nothing as direct as I was hoping, but good enough.
Ultimately, I had to use ground on pin 1 (black), and short pins 2 and 3 (purple and yellow). Without the short, the combo meter did not light up and the new triple meter gauges would not power on. The headlight dimmer does not seem to function on either of the power wires, must be a CAN function. I can live without my gauges dimming, at least until I find another wire to tap.
Here is a picture of my harness connected to the wires included with my gauges. The orange wire is for the dimmer.
