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it is due to the different locations where the temperature is being read. If you have the aftermarket sensor in the hose to the radiator, that location will take longer to heat up (WHILE the thermostat is closed) than the stock location (which is in an aluminum part bolted to the engine block). There's a weephole in the thermostat that will move a small volume of coolant into the radiator piping when the thermostat is closed. This, along with the conductive transfer from the block, will heat the stock temp sensor quicker than an aftermarket one mounted closer to the radiator. While the thermostat is open, both temp gauges should read about the same temperature, at about the same time.
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