[99K1500]

Because I have looked around everywhere and finally found it in a thread at
the12volt.com

I pulled a auto dim/compass mirror from my '99 Tahoe that I traded in, I cut the wireing harness at about 6" from the mirror, the temperature sensor about 6" from the sensor (behind the front grill towards the bottom.)

There are 7 wires in the harness you need five for the mirror and 2 for the left and right hand mirrors. I did not take the side mirrors from the 'Hoe so I only needed 5 of the wires.

Red (dark pink) ---- Power ( ignition switched 12 volt)
Black -------------- Ground
Lt. Green -------------- Backup light ( I failed to hook this one up yet.)
Green with Black ---- Temperature probe ( same color at the sensor.)
Brown -------------- Temperature probe (same color at the sensor.)

the light green for the backup light keeps the mirror from dimming while you back. Again there are two other wires but unless you have the side mirrors they are of no use. I did not have to re-calibrate. the system fired right up and works beautifully!
I hope this helps I did some looking around to finally find what I wanted.

99K1500