Re. the gauges:
I talked to the dealer I got my RTV from.  He said Kubota will replace the gauges that are fogging under warrantee, but...  It may be awhile.  He said Kubota is looking for a different supplier and once that's done, the demand will by high.  
I saw in another forum somewhere (haven't been able to find it again) about gauges fogging that they believed the gauges may be fogging up due to a flaw in the manufacturing process where they were sealed up before the glue or something inside had a chance to dry.  When heated, it caused the fogging effect.  At least for mine, I still think it's humidity.