defective guage cluster??? again HELP PLEASE

This is wierd my guage cluster is screwy. for the speedo needle somtimes will move way up and themn i cant get the right speed or it will stop working, and when i turn my headlights on the lights in it go completly black and then finally turn on about 15-20 secs later. any way to fix this or do i need to jusrt replace it with a new cluster?