wireing gauges

alrighty i fixed my parking lights now i just need to wire up my new el glow gauge faces, i'm suppose to wire them to the dimmer swtich now which of the 3 wires are postive and which can i ground to?

http://www.stealth316.com/2-wiring-tips.htm

I used this for installing my boost gauge. If you mean teh 4 wires behind the rheostat(dimmer thing for your dash)

"Wire/pin 4 (green with white stripe) is the +12V into the rheostat. Wire/pin 3 (black with yellow stripe) is the ground into the rheostat. Wire/pin 2 (black) is ground out of the rheostat. The rheostat dims the lights by increasing the resistance to current ground. Tapping into the +12 volt in wire (green with white stripe) will supply light-switched, full illumination to your unit. Tapping into both +12 V in wire and the ground in wire (black with yellow stripe) will give dimming capability to the your unit's light. However, some units use the ground wire for other purposes than just a light. In this case the unit's ground wire should be connected to the chassis (if +12 V comes from the harness) or the ECM (if +12 V comes from the ECM). "

The page has pictures if you need them.

I tapped the green w/ white stripe for power, and then grounded to a bolt on the chassis behind my clutch.