Someguyfrommaryland couldn't of said it best..... I think its just part of the whole MB experince. My gauge has been jumping around as long as i can remember. Its almost getting to the point where if it doesn't jump around i think its broken. I had a friend borrow my car once and tried to fill up the tank to realize that it was full. The gauge reads backwards compared to American Cars. I thought that was pretty funny. I wouldn't worry about your gauge.......