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I was under the impression that most guages are sealed at the factory(sealed to be waterproof, anyway - not talking about tampering); if that's the case, any condensation will be fresh water, and should be fairly benign (certainly more benign than opening the case to salt air to get rid of the fresh water.)
Perhaps a Merc mechanic or marine electrician could tell you whether it's possible to open and purge the guages (filling with dry nitrogen would be ideal), but I suspect that just living with it or replacing the guages are your options at this point.
jky
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