I was driving one day, and my gas gauge and speedometer suddly stopped working, i change the fuse and its started working again but about 3 days later it blew my fuse again and now every fuse i insert it blows it. An yes its the right fuse size but could it jus be a bad wire?

 

I believe that is a short. You MUST find where the short is otherwise you will get the same result each time.
Time to break out the wiring diagrams and find what wires run to that fuse and then start a process of checking each wire visually.