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Use something like the ELM327 adapter and Torque Free, you can query the ECU while it's running, "What ECT do you see? How's the MAP? You happy with the O2s? How fast is the engine cranking over at? What gear do you think you should be?" (Well, not in THAT form!)
And best of all, you don't have to see what it says while you're driving, you can datalog it and THEN examine it!
Yep Ralph that Lil ELM tester works great an I got one online for under $10.an theres MANY free great apps to read the engine info.
Heres the one I use..
An App I like an free - CarSys