[codefox1]

Not sure what the issue is here. If the glass is OK, and I would only proceed very carefully with paint thinner and never water on back. Then the pointer would be in the middle and you don't want it to scratch glass on front or back plate. If the back plate is rusty or really nasty, clean it up, spray with krylon of silver or copper hue as best as you can dentermine, and put it back together. Assemblies often had rubber spacers which have probably turned nearly to dust by now. Beg a scouple of rubber gasket scraps from your local auto repair shop and replace. You can double or triple up pieces if more room is needed. Replace the pilot lights as well, even if they still look good. Depending on the set, not good news when they fail.