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Originally Posted by ecoli
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.
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Agreed.
EGT gauges are awesome if you have controlled conditions. If I had one per cylinder, and I was tuning on an engine dyno, then I'd use them.
For a street car, they are an annoyance that causes panic where there is no need for one. Unless like above, you have a stock ecu and can't datalog timing, but as far as a tuning "need" its more of an assistance who's imput isn't really needed, but you get anyway. It will tell you where your timing is shifted to, not how good of a tune you motor has.