<strong>Yahoo Message Number: 107520</strong>I want to comment on exhaust gas temperature (EGT). <br/>The most valuable gauge on my instrument panel is my EGT gauge. I have found when pulling a grade if you wait for the transmission to shift down the exhaust gas temperature will be in the high numbers 12 to 1300 Fahrenheit. I believe this is what has caused many exhaust manifolds to crack....