Giver

This truck was recently bought used and the speedometer, odometer, gas, & temp gauges are not working, but the amp and oil pressure gauges are working. The odometer won't light up and the needle for the speedometer doesn't move.

I'm suspecting they are all related by a wiring harness that might be gunked up or a bad ground on the body? Just don't know where to look since I never owned an S-10. Also need to know the fuse numbers to check for these various components, both inside the cab and under the hood if they are in both places.

Thanks for any help in getting this old girl back to working order.