Most newer laptops now have either an S-Video output (mostly) or a composite output (sometimes). With S-Video, you can get a simple adapter to make it composite, which is probably what you will need for your indash screen.
gizmomkr, if I could kiss you, I would. I have a presentation coming up soon and I was going to use a TV that only had composite/coax in and I could only get it to show B&W. The RCA to SVideo adapter I was using didn't have pin 3 connected to anything.