my temp gauge doesn't work.
 

I have a 2002 lancer oz rally and the only upgrade I have is exhaust. My temperature gauge was working fine when i started up the car, but about 5 minutes into driving, it will drop all the way down and won't go back up. Just wondering if anyone else has had this problem and if so, what was wrong?

Check your coolant level, also it should be all the way down when you start the car already