I bought my wife a 2006 Expedition EB and want a flip down DVD player mounted where the factory one would be. My question is can the DVD audio be hard wired to the factory head unit like it is in the factory installed ones. It has the 6 disc indash mp3 changer, so it does have the AUX input. Any connectors available that will plug into it and allow audio from the RCA out on the DVD player?? Thanks in advance.