by P2 i am guessing you mean PS2. basially you need a video booster, and an fm modulator.
hook up PS2 video and monitors to booster, then hook up PS2 audio to modulator in between radio and antenna. hookup power and ready to play.
if you want to add more later, like a tv tuner, dedicated DVD player, VCR Player(do they still make these???) 2nd game system, you can get a A/V controller. that will allow you to watch one tv on one screen and passenger can play PS2 on screen two. also let's you add more screens later (under the hood if you want. to keep you engine entertained on long trips lol)