[Shane@DBPerformance]

An EGT gauge is mostly only useful, if you are running a stock ECU and you don't have a way to datalog timing. Then you can somewhat use it to know when you are knocking bad and the stock ECU is severly retarding the timing. Otherwise, it doesn't tell you if you rich, lean, or even close to tuned correctly. They are useful, if you run one on each cylinder and want to do individual cylinder tuning for maximum overall power and reliability.