my audi a4 1.8t 2001 just had a full service as i just bought it 1 month ago anyway the temperature gauge used to work sometimes and i got the sensor changed and still same problem i think it got even worse now as yesterday it did not even work at all i asked my mechanick he said its not from the thermostat but from the gauge it self i phoned audi they dont sell it but they do sell the whole dashboard 500£ its alot for a little problem and they also stated that it can be alot of problems causing the gauge not to work normal so its not even 100 percent, my heating system in my car works just fine and car drives normal it just the gauge really thats all i realy need some help please