98 blazer the meters dont work

i am a proud owner of a 98 chvy blazer ls and im haveing prablems but my concern now is that my sppedomiter my rpm gage, and my fuel gage, and my new cd deck isent working. at first every gage dident work but all that work is the temp, oil, and battery gage. i think its a fuse problem but i dont know plz help. :banghead: :banghead: :banghead:

i found out the prablem to day it was a fuse # 15 in the 19 spot but my mph metter is racting slow will that change