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Patrick: Unless you have remote valve hydraulics and using hydra creeper drive, that gauge will probably never move from cold. It probably will record heat if one lets the hydraulic resovoir run low in oil, however by the time the gauge records hot in that senario, one has already cooked the pump. Over the years I've had 3 tractors with the gauge and 3 that never had the gauge from the factory. One of the tractors with the gauge was bought new and I've yet to see it move from the cold mark. Of the three offset tractors I still have, only my Super A had the hydraulic temperature gauge. I removed that 20 years ago without any adverse effect. My 130 and 140 never had the gauge. All three of those tractors have their original pumps, touch control has never been rebuilt and hydraulics still perform as new. Secret to running one of these tractors, is every time you check the engine oil level, also check the hydraulic oil level. These do not have a very large hydraulic oil resovoir, thus even a small leak can soon empty the system, and that is the single biggest reason for hydraulic rebuild.
Most of the Super A had the gauge, however not many of the 100, 130 and 140 ever had it unless buyer requested the option for his particulr hydraulic use. Personally I'd never replace a hydraulic temperature gauge on one of these. I suspect if you delve into the matter you'll find the gauge was always an option.
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