Temp gauge sender location

Being the contrarian that I am, my aftermarket temp gauge is a mechanical one that is in the top radiator hose and I like it. Previous owner did it. It measures the temperature of the water leaving the engine, so I can tell when the thermostat opens and closes by water flow that passes the sender.

I still have the factory one too, so I can see if the engine overheats with that one. That is a common complaint on having it in the radiator hose. If you loose coolant, my aftermarket gauge wouldn’t show overheating.