I am having the same issue, except my gauge reads WAY low - I have a new sensor and thermostat that is going in this weekend. With the A/C on the gauge goes to slightly below 1/2 way - and some engine coolant leaks out so I am sure its boiling.
Its possible that the radiator is partially clogged needing a flush.
My fan viscous coupling/fan clutch is about shot as well, it is easy to stop the fan when the engine is running. About to change to 2 x 14" electric fans.
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Black '02 Discover SII, Auto. 
Black '87 Suzuki Samurai, rock crawler  :
Black '94 Discovery SI V8i, 5 spd (Currently DOA)
--## If you have enough time to do something over again, you had enough time to do it right the first time. ##--
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