I have observed this on gages from from time to time. It is interesting someone else also noticed it. My theory is the gage is acting similar to a solar panel. The sun's energy passes through the glass and is absorbed by the black gage face. This causes heating the air and increases the humidity inside the gage. The glass remains cool enough to cause condensation of the now, very humid air.
I do not have any gages with white faces. I always wondered if the sun caused condensation to form on these gages. Perhaps someone could comment.
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