temp gauge intermittently not working?????
 

ok i gotta 2001 a4 quattro 2.8 30v....its got 77k on the clock and just recently my temperature guage started not workin intermittently...cant find a constant as to when it stops workin or starts again....but i did notice this, when the car is runnin it registers full cold but it does lift a lil tiny tiny bit from when the car is off and no power is goin to it......any ideas on what this can be? im hoping its not the cluster cuz i dont wanna have to go thru all that....please some1 out there tell me they had this problem and it was just the temp sensor or something?