What to do about OLD CHROME

My 66 Barracuda gauge cluster has no luster.

I have 3 clusters and the common trait is that there is no chrome left on anything. I don't even know what it's suppose to look like, but I'm assuming that it isn't suppose to be that old base plastic.

Aside from dropping a small fortune into a specialty chrome job, what can be done??

I've tried the spray paint chrome......In what reality does this come close to chrome?! Can't understand why this is one thing that can't come out of a spray can.

Be that as it may. What should it look like and how can I get close?