A carputer is similar to a computer but it is like a computer in one's car. A desktop computer needs a plug in and therefore needs to be in one's house and cannot be in one's car.

You need an OBD2 reader which plugs into the standard socket fitted to all modern cars. Typically, this will have a USB connection which you plug into the carputer or laptop. You also need software to display the information on screen. Check the OBD2 Link shown for a full explanation of how to go about this.

Please see attached link. Good Luck http://www.mp3car.com/vbulletin/worklogs/80285-2001-pathfinder-carputer-my-first-install.html