Sounds more like air in the system, any time the guage goes up and down air is the cause, change the thermostat with OEM, vacume the system and fill with coolent.
It sounds normal, but perhaps the radiator is a little small. Make sure the core is clean by blowing it out with compressed air (from the engine side) to clear out bugs and other debris. Make sure the overflow/reserve tank is at the proper level. Check the coolant level in the radiator when engine cold--it should be right at the top of the filler. These are all preventive, not a cure for anything.
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