wow, been a long time, i had to sell my vx last year but ill try to help.
on the gm console the compass function and sensor are built in to the circuit board, the tem sensor require two wires and if i recall the ground is shared. some of the wire from the lights can be spliced into the display, like the constant and the grounds, and dimmer. you will need to run the ignition 12v a dimmer line and a regular ground as i think the existing ground is a switching ground. im sorry i can provide wire colors or a schematic, mine went with my vx, and i am told it was exported to Russia....
I hope this helps a bit... best of luck!