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If your are talking about the trim rings around the gauges try some of the ceramic silver paint or chrome paint a couple coats let dry then very lightly rub with double oo steel wool.
Did you damage one and trying to make a good repair or you trying to match something up with the bezel on the Autometers?
I am redoing my interior and want to match a couple of items with the same color. The center of my MOMO steering wheel for one, the rest I am not sure what just yet.