We just bought a 2000 marquis Amythest and have to change out the camera and monitor (alpine).  Problem is I do not have the access panel in the back closet like everyone else.  There is a 12 vdc breaker panel and a 240 vac breaker panel directly in front of the camera.  Do I have to remove the a/c breaker panel and maybe remove the main feeds, next door to it, as well?   Also, how can I remove that access panel on top of the dash above the instrument cluster?  We can not go anywhere until we can get this fixed.   That and the rear b/r slide is all that is left to hit the road full time.  
Sam and karyn
Florida