Sorry to burst your bubble, Trigger, but y2kiah is right. It's EGT.
Why do you have to use four motors/servos? You can use two, one for each engine, and gear the smaller pointer to the larger one or vice-versa, because they have a constant relationship with one another.
That looks like Solidworks. Is it? I'm using the 2009 student edition for my (A-10) pit.
Anyways, great job and keep it up!:thumbup: