Fabbing a new instrument insert is pretty straight forward. Just remove the existing unit and make a few good patterns from it, then transfer that to whatever material you want to use: Stainless, carbon, colored plastic, aramid, copper, glass, turned aluminum, whatever floats your boat. The translucent stuff you can mask from behind with an opaque material to control lighting. The opaque materials you either have to cut out stuff like the numbers and idiot lights or illuminate from the front.

One thing that's really cool is to scan your existing insert, adjust it to your liking then print it to good transparency material. Then transfer that to an electorluminescent material (similar to indiglo) that's been cut to shape. Then you have an indiglo dash!

This is all pretty inexspensive material wise but attention to detail and patience really pays off.