[QUOTE="Elmo"] how far do you want to take this? you can go hog wild and measure the working temperature of each piston, each bearing and each exhaust valve if you really want, and you can justify it in terms of "predicting more serious problems".[/QUOTE] That's what Steve and his narrow-minded people want. They don't understand the REAL world in which the typical car buyer lives.[/QUOTE] I guess I'm not typical then, as since I purchased my old F-150 I've added a REAL oil pressure gauge (thanks Ford!) a dash cluster with tach, a transmission temp. gauge, and a vacuum gauge. (the last was somewhat extraneous, but I had a hole to fill.) Personally I consider at least a water temp. gauge and oil pressure gauge a must; oil temp., trans temp (if automatic) tach and vacuum are nice options. The oil pressure gauge has given me great piece of mind with the Ford, as it consistently makes a noise that sounds precisely like worn rod bearings. However, the oil pressure is rock solid stable, even when lugging the engine (and that happens a lot, being the 4.9 I-6) therefore I can only assume that it is either piston slap, an exhaust leak, or something equally benign. You simply can't get that kind of confirmation/denial of a theory as to "what's wrong" from an idiot light. A gauge is a hell of a lot cheaper than an exploratory teardown (which would probably turn into a rebuild, "while you're in there.") nate