Doubt the gauges are fused, but can't hurt. Check fuses. Other than that, more than likely in the cluster or cluster connection. Corrosion on the back of the gauges (the post/nut) is one common problem, as is the printed circuit board contacts peeling.
Dorian
My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
No anti-theft measures on your truck? No pity when its stolen