Every truck and application acts different with load and EGT. Just knowing how EGT ramps is very helpful. Now that Ive had a gauge, I could drive my truck without one, but when blind, it was a risk not worth taking. For me when towing, extra power is overrated--I wont drive any faster with it and dont need to climb the hill any faster. Although it is kinda fun now and then passing a few cars with a good load on a 5+% grade.