Robert there are many outfits that restore and repair gauges. Keep in mind that the gauge is only part of the unit, the sending unit must be functioning properly and matched to the gauge and the wiring or tubing connecting the two must also be functioning. Also electric gauges must have a good power source and a proper ground.
Any auto or truck parts house can get you all kinds of gauges but remember you must also have the matching sending units and connecting systems.
There are also places that will build you custom gauges with any face and bezel you want. You can even have a complete digital dash built. Again they all will need matching sending units and connecting systems.
It all comes down to how much time and money you want to spend. Good luck
"Socialist governments traditionally do make a financial mess. They always run out of other people's money. It's quite a characteristic of them."
~ Margaret Thatcher ~