Interesting question. I don't see that heating it would do much. In the event there is free water, heating the air inside the gage would only act to increase the humidy. Once the gage cools, the water would simply condense out again. I would suggest placing the gage in a sealed container (Tupperwear) with a desicate such as the Silica Gel used in gun cabinets, etc. Set the container outside where the sun can hit it. As it heats and cools during day/night the humid air will be forced out and dry air pulled in. This breathing process will dry the gage.
To speed up the process you could drill a small hole in the gage case. The gage could then be purged using very low pressure and dry air (use a desicate drier) from your air compresser. This hole should be sealed after drying the gage.
The bad news is this is not a cure and the gage will probably form condensation again if exposed to excessive moisture in service.
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