Thermal sensor what is it electronically?

Hello.

I ve got a Dell 48DY8 motherboard.

Recently I had to replace a 1150 socket motherboard (lightning over lan cable), by now 2022 these motherboards are scarce. However a number of Dell 1150 motherboards is available at good price. Some tinkering is required, since I do not have a Dell computer case so I need a:

8 pin power connector,

wire the 5pin power switch and led,

deal with the front I/O connector, 

deal with the cpu/case fans connectors

deal with the cpu heatsink installation

use something for the thermal sensor

It is obvious I am missing all these components

About the air temperature sensor, what is it ? A 100k thermistor or similar?

If I have missed a specific to Dell desktops issue that I have to deal with please advice.

Thank you.