I just purchased a factory overhead Panasonic DVD player, the one to be used with a sunroof. This unit apparently came out of a 2006 Escalade. Can this be installed on my 2002 Escalade. Does the 2002 Escalade come with the wiring already to integrate the dvd with the car speakers? I only have the overhead unit, no cables or anything. Do I need any additional cables/harnesses or is that already in the vehicle somewhere? I will appreciate any input. Thanks!