If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Search the site by type in the "brand name" to your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
cant realy see the photo too well , but one thing these do have is a wire to the neutral safety switch that needs to be connected , its only on the indash models as its ******* in most states to have this on while driving , if it was just a player and had no monitor then you could put the monitor in the back , and all is well . ck your wiring diagram I bet youll see it