do you still have the power connection that came with the dvd player or did you cut it off to get power somewhere else?
If you still have it, its a 3 prong connection and there is an available slot under the dashboard for you to just plug it in. Its a 12+ a ground and a switched power so it will turn on only with the key.. if you want I can take a pic of that as well
Steve
Edited***
Click on this link. Its a thread that shows where you can just plug the power into... its exactly how mine is hooked up.
http://www.tahoeforum.com/showthread.php?t=421