I have a AVH-6800DVD and a AVIC-9DVD I wanted to know if the AVIC-9DVD could work on the AVH-6800DVD and if so what do I need to make it work like cables or anything else

Yes, it works nicely and integrates well. You will need a touchscreen upgrade disc (CNDV-70MT works fine) and an RGB cable. I forget the model # of the RGB cable, but it was $80-90 new if I recall correctly. I got mine new on eBay for about $30.

Thanks for the info. I have the disk on it way and I am looking for the cable but I found two part numbers one is cd-rgb600 and the other is cde7024.