Temperature gauge: Dashboard indicator that states the temperature of the running engine.
Mehr lesen
It may be analogue or digital. It should never reach the highest level in the scale (red scale). If that happens, that means that the engine is overheating, so you will have to stop the car immediately. You should go see a specialist to identify the exact problem as soon as possible.
I replaced the thermostat in my lancer today but the temp gauge will be at normal when driving but when parked and heater on the temp gauge decreases why