Another Problem...

Well I figured out the stuff that was wrong before...Too much corrosion on the battery to prevent it from starting and all I had to do was unlock the door with the key to turn off the alarm...This isn't really anything important but just something thats a little bit annoying...Well anyway to correct it, I thought it was a 1995 Golf GL..buuut I was one year off its a 1996 GL. Anyway my gas gauge doesn't work..any helpful hints for things to check out for a way to correct this? Thanks in advance!