EGT (Exhaust Gas Temperature) measures the temperature of your exhaust gases. It is not the same as coolant temperature as that measures the temperature of the coolant (whether or not you're overheating).
EGT's give an indication of what the A/F ratio is. EGT gauges were used as the old school way of tuning before wideband o2 sensor gauges became affordable.
Since the widebands are affordable, EGT gauges have become obsolete. They are still good to have in conjunction with a wideband.
Do not get a A/F gauge. They're just christmas lights and do not work well at all. If you want to monitor A/F ratio, get a wideband o2 sensor gauge.
Originally Posted by
Maverick
I dont like the loof of gauges on the B5 S4's.
EGT gauge is just measuring how hot i am. I dont know what's the normal temperature when I am supercharged.
that coolant gauge will do the trick for me because I can easily know I am not overheating
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