David,
Normalise would be fine too but again, useless, unless you can see where one EGT has moved away from the rest of the pack without having to visually scan for it (DIFF). I'd rather hire a piece of code to do that for me. I like looking out the window and getting audio annunciations.
Kelly,
Problem with programming bands for EGT temperature ranges is that there are so many, with none really being normal. EGT changes with mixture of course, but also with outside air temp, humidity, altitude, manifold pressure and rpm, horsepower output, and probably a few other things I can't think of. I have found peak at 65% power, for example, at 1500 degrees, and on a different day, over 1600 degrees. I have seen full rich takeoff EGTs of 1200 degrees at one airport, and 1350 at another airport (different day, altitude, temperature, etc.) . Then, you get into a pattern of ignoring your range marks, negating their usefulness. Absolute EGT numbers mean nothing. A single, rogue EGT has a story to tell.