Courtsey Light & Fuel Gauge (Quick Help Please)!

[PHOENIX]

OK I have been ripping through my dash board all day yesterday and so far all day today. Im getting alot done, but I have a question about the courtsey light. Ok its mounted under the dash by the heater outlet. It has two wires going to it Orange and White. When the light is OFF, both wires (orange & white) have 12volts + power. When the light is on only the orange wire has power, the white no longer has power. How does this work. As long as the bulb is getting continious power it wont light, but as soon as its only getting power from the on source then it lights. How can I hook up another courtsey light that will turn on with the one under the dash. I can figure it out, its mind boggling.

One more thing, what color wire goes to the fuel gauge in the dash? From what I can find its pink. I hooked every wire to my tester and the only that gives resistance (ohms) is the pink one. My tank is close to full and the ohms is reading 109 and up. I thought that 90ohms was full. Whats my problem here?

The painless wire harness is also giving me alot of problems and Im about to replace the plugs on it. Im not very happy with the main plug connection, its not a very good design in my opinion. It is making me very mad

The faster the better, I have to drive it to work tomorrow and I have everything ripped apart.

Ohh yeah, I got almost all of that cheesy aftermarket A/C system out, boy is it easier to work in there now!