Interacting with Onboard Car Computers?
joshmccormack asks: "I've seen lots of projects where people are making great looking computers that fit into the dashboard of their cars that play MP3s, movies and even some that do some GPS and mapping stuff. I'd love to find projects where computers connect with the on board computers in most cars from the mid 90s on to show temperature and performance of various parts of the car. There are diagnostic tools that mechanics use, and that you can get to get data, but I'm particularly interested in real time, in-dash, open source options."
Electromotive Systems makes a system called T.E.C. (Total Engine Control) that performs the functions you're looking for and much, much more.
Trending off-topic, but in their FAQ they say "We have systems for all vehicles with spark ignited engines."
Even this one?
(I had a friend who bought one of those... it had rust in the door frames within a week of purchase!)
Stressed? Me? Of course not. Stress is what a rubber band feels before it breaks, silly.