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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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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