4 screws removes the faceplate
from the cluster assembly.
The clear plastic is riveted to the black bezel that covers your gauge faceplates.
This can be a P.I.T.A. to remove, but it can be done. I use a dremel to grind off the 5 rear metal rivets holding from the rear. (not the front!)
Then I push them forward, out the front 'clear' faceplate. From there, you'll see what you need to work with. (or reproduce)
If you're handy with clear lexan, you can make one to fit pretty nicely.
I expect you'll need a heat gun and a wooden framework to put a bend in the plastic. Good luck!