It's impossible for a temperature sensor mounted in the water pump/thermostat housing to measure oil temperature. There are 2 seperate sensors, one for the engine coolant which triggers a warning lamp and another for oil temperature, which registers on the gauge. While the part numbers may be the same, it's like our engines' coils. The ignition coil for cylinder 1 does not have a different part number than the one for cylinder 2, et.al. They are the same part, just mounted in a different location. I'm not sure exactly where the oil temp sensor is located, but from diagrams it appears to be adjacent to the oil pump.
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