Wikipedia definition
1. Exhaust gas temperature gaugeAn exhaust gas temperature gauge (EGT gauge) is a automotive meter used to monitor the exhaust gas temperature of an internal combustion engine or rotary engine in conjunction with a thermocouple-type pyrometer. By monitoring EGT, the driver can get an idea of the car's air-fuel ratio. At a balanced air-fuel ratio, the exhaust gas temperature is lower than that in a lean or rich air-fuel ratio.
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