Hook into a wire that is only hot when the lights are on. Preferably find the one that is connected to the dimmer switch, use a test light and when you have the cluster pulled out (with the lights on) find a hot wire. Next spin the dimmer and see if the current lessens (test light goes out). Use that for the power because then they will dim automatically with the stock headlight switch.
For a ground, you can either tap into one of the ground wires leaving the bezel, or if you don't feel like searching for one, run the ground wire to the floor near the pedals. To the right of the gas pedal, right under the OBD connector, there should be two green screws. They are 8mm and just strip the insulation off the end of the wire and wrap it around the screw and tighten it. If you want to do it perfect, crimp a terminal on the end of the ground wire and put the ground screw through it.
I have the Speedhut gauges, and I'm assuming they are very similar. I monted my color changer to the right of the steering column right above where my right knee is. The tape that came with mine sucked, and it fell off, so i got some 3m double sided tape and it has stayed on since.
Email me with any questions and if your really stuck, you can call me and ill take my cluster out and tell you exactly what wires I tapped into.
Andy
hey guys just got my new upr el glow white face guages today they are really nice exept for them saying to use premium fuel only which is not true on a mustang gt we all know. i wanted to install them today but i dont like the fact that the directions that came with them suck. i was wondering if anyone else had any and if they could tell me how you all set them up. i need to find a really good ground then i need to find a really good 12volt power sorce then i guess i have to tap into a light swith or something to be able to dim them and every thing i really do need help guys im not to good at any of this stuff pictures would help a hole lot and then i need to figure out were im going to put my color changer swith that came with it it looks really fragile the only thing that is holding it on is a strip of plastic that has 4 or 5 wires wires going thru it. any help would be greatly appreciated thanks guys. 
