Coolant is still running too cold?

[jay see]

Stock temperature sensor in on the coolant out port on the cylinder head as in below picture.
Today, I extended the aftermarket sensor wire and fitted the sensor right next to the stock one.
Extending the sensor wire didn't upset the temperature reading accuracy that much. About three quarters of
a degree lower than the reading before, so it's ok.
I ran the engine for about ten minutes on idle and temperature didn't go above 63 degrees.
So, it's even worse than the readings I've got before from the T joints of the heater core/LPG converter.
I'm assuming the the thermostat hasn't opened up. So, I'm gonna take the vehicle for a drive tonight and see how it goes.
I'll post the outcome.
If the temperature is still low, then my last temp sensor installation spot is inside the thermostat housing.
If the temperature reading is still low, then I think I would have to say the engine's running bit cold, either due to
thermostat opening up too early or water somehow leaking through the thermostat opening valve/housing.

If you're running for 10 minutes on idle and only getting a maximum of 63 degrees I think the thermostat is stuck open. It only needs to be a little bit. Mine was stuck open by 1-2 mm and that was enough for my temps to stay quite low.

I've never seen a sensor installed in the actual hose like that before don't know if it makes a difference or not to the temperature.

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