1928 Gas Gauge // repair

Go to the "Search" spot above your message and type in "Gas Gauge". You'll find a thread about replacing the float from about a week ago, removing the gas gauge and everything else you'll need to know about this. To answer your question, it's a gasoline=proof black paint on the polished metal.
 
I used a satin black laquer for teh numbers, then wiped off the excess. After the paint was dry I rubbed some fine sandpaper on the aluminum guage to polish the aluminum and remove any remaining black from the surface. It came out great.
 
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