I have done it but I can't find the tread I used. All you need is a switch and some 16 gauge wire.
1. You have to find the reverse light fuse under the hood, tap a wire into it.
2. Get power from somewhere, I got it from the battery but you can get it from anywhere you like.
3. Get a good ground, I got this from a bolt in the floor board.
4. Run the wires into the truck where ever you want the switch.
5. Cut hole for switch and attach wires. I put my switch in the little cubby hole next to the headlight switch. DONE!
Here is the switch I used
http://www.amazon.com/Pilot-LED-Rou...EO/ref=sr_1_33?ie=UTF8&qid=1304448921&sr=8-33 I got my from Autozone for like $5.
Took me about 15-20 min. Cheapest/best mod I have done. Hope this helps!