Help with DVR System Setup for Ambulance

[tedkeano16]

I have been left a rough circuit diagram of an dvr system for an ambulance by a colleague who has since moved jobs .what the unit consists of is a camera on the rear of the vehicle with a monitor up front displaying the outside of the vehicle when reversing. a dome camera in the back of the vehicle that is looking down on the inside of the vehicle and the monitor up front can display this a panic strip running on the ceiling of the rear of the vehicle when pressed will start recording the inside rear of the vehicle i have a diagram of this which i can forward on what i need to know is what type of video splitter leads would i use and what type of 12volt five pin relay to use if it is not clear what i need i can send on the circuit diagram

 

[NoTime]

Video splitter doesn't seem to fit with what you are asking for and unlike audio it would need to be a powered device, not a cable.

They sell ready made switches like this that could probably be used as is or modified.
http://www.nextag.com/Startech-SVID...rices-html?nxtg=38e60a1c0528-3C40B8BC6B4F5DB4

Some potential roll your own relays
http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=1049448;keywords=relay

There are also various electronic switches w\that can be wired up.