yeah have you already got you monitors and ps2? as the monitors you use will have to have the right inputs in the back of them (cant remember off the top of my head which ones, but most monitors do have them).. but get youself down to the local maplin to get a 12v transformer to allow the ps2 to run on 12 v..
it looks like a normal house socket, with a plug etc, and can be wired either to your cigg lighter, or hard wired to your battery.. think its about £40.. have you tried a search mate?>