BTW, Welcome to the forum! I just noticed these were your first two posts.
The Ford chassis would be an F-53 with the Triton V10 engine, the Workhorse chassis would be either the W20 or W22 with the 8.1 liter V8.
I would start by checking any fuse related to the Instrument cluster.
In my F53 Owners Guide, there are a couple of pages showing the fuse panel. My inside fuse panel is located to the left of the steering wheel almost by the left wall of the MH. The other fuse panel is called the Power Distribution box, on my coach it is above the radiator.
Good Luck, and again, Welcome!
Stewart, Brenda and kids
2008 Newmar Canyon Star 3410