You are going to need a switch box to run the cables from the unit you have into it thats only if you have your monitor separate from the unit meaning not attached. After that you can connect your game (PS2 or Xbox)into the switch box input and run the output out from the switch box to your monitor. You should get a box that can hold up to 2 to 3 video inputs now the audio that might be tricky being that you dont have any inputs on that unit you say. Does that have a screen made into the deck or is it separated from it? If its attached to the deck and you have all outputs thats kind of strange unless they have it you can just hook up more monitors to it. Also is this the only unit going into your car like this is the dvd player and do you have fm and am with that or are you using something else for that as well like another head unit? If so you can hook your audio up to the receiver that has a radio being if it has audio inputs. Can you give a little bit more infor for what you have in your car and who makes them. this will help me understand what you have and what I can tell you what you need.