This will be a serious job to do, b'cos your cable harness is missing allmost all the wires and connecters that are needed for your boardmonitor installation.
You also need a new radio module in the thrunk and again all the wires there are missing b'cos of your radio and speakers are now wired to be in the front.
So you basicly need a new cable harness that runs inbetween your dash, all the speakers and the frame in the thrunk, a new radio module, a MK3 or MK4 navigation comupter and lots, lots of time.
To be honest, allmost the only thing that is inplace is the GPS antenna for the rest everything needs to be changed or rebuild.

BTW; There are two versions of navigation computers, one for the monochrome display and one for the colour displays.
The monochrome display gets the information throu a data link (IBUS) and the colour ones throu RGB video directly from the navigation computer.

Cheers,

__________________
E46 320i touring
E46 328i sedan
E53 3.0i