This page discusses how to test water temp gauge sensor for accuracy prior to installation. Placing the probe in boiling water will let you know if the gauge is accurate. If it displays 212 deg. F at sea level, it's good.
Page One
The next section of their explanation discusses the proper location of the sensor. They say that the best location for a water temp gauge sensor is in the intake manifold water jacket near the thermostat and the best location for a water temp warning light switch is in the cylinder head.
Page Two
Testing and installing both a water temp gauge and sensor can provide some good info on the enginerigger at h. A warning light switch may higher temps (235-260 deg. F) and can let you know of a spike in cylinder temp, while the gauge sensor near the thermostat will let you know that the cooling system as a whole is working properly.
This is the best explanation I've seen.
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