Thanks Torben,
No this is not for a specific car per/se. Although I would use it for my car, I wouldn't like it to be for my car only. What if I change cars? What if I have an old car and a new car (which I do)? Then I wouldn't be able to use something that only functions with an ODBC port.
In short, I think it would be best to view this from the perspective of an automotive shop application. I would want to test just about every electrical component of a car (AC and DC) with, I would imagine, a pretty high range of voltage. What would you think, up to about 100 volts?
Can this be done? Is this possible? Am I asking too much?