If it’s any consolation I had a 1986.5 from new and managed to clock up 250.000 miles with the original engine, ok a few BHG`s on the way and a puff of black smoke now and again. The radiator should suck up the coolant from the expansion tank when left over night, so there should be no need to top up the radiator unless the expansion tank is so full and overflows and looses coolant. In my experience the temperature gauge only reads high when it just about to run out of coolant or the water pump has packed up (mainly due to the impellors worn out) I would check the water pump and the condition of the radiator.
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