1. O.K. fuse changed...
2. Now try checking/replacing the bulbs. (about $2ea)
3. If that doesn't work check the ground. (I ended up getting a ground wire soldered to the back of my instrument cluster)
4. Last thing that could be the problem is the Rheostat
5. If the lights still don't work, take it to the STEALERSHIP
When my car was having similar problems, I went as far as #3.
Good luck.
jrmd01@yahoo.com