Changing gauge light color

Never had much luck with paint sticking on glass, paint gets hot and flakes off. You may consider bulb caps, never tried these..... ebay, bulb cap covers

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Searching for the bulb covers I found auto meter also made them, I ordered the green ones and they look spot on for the gauge cluster color.
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It's a little hard to see in the picture but it looks way better than before.

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