I have a Car-Computer (Windows 7) running in my car, and it uses a program called DashCommand which reads OBD data and displays it on a screen. Another member does the same, and he has a picture on the third page of my build thread here:
Car Computer / CarPC - Upcoming Build and Journal
That may be something you can be interested in. It's fully custom built by parts I sourced, and it's not too hard to do if you have experience in electronics and building computers. I'll take a couple pictures of my DashCommand setup when I get home tonight. It's got the GT-R style overlay too.
Another thing you may be interested in is a dedicated computing unit for that data readout, called Magden:
(Pic of the display)
http://i40.tinypic.com/2zhm93l.jpg
It's a dedicated computer that displays the data much like my personal Car-Computer, but it's faster and has better support. Unfortunately, I think they went out of business.