I've had a few pm's asking me what the temp gauge is used for. Its basically to measure in degrees celsius how hot ur engine or radiator gets. In my case i used it to monitor the engine temperature when cruising around.
Its really good coz there was this time when i was driving on a hot day and the gauge told me that my engine was overheating so i pulled over b4 possibly damaging the engine.
Anyway i hope this helps guys.....