Help needed can you identify this?

[kodos]

Hi all

Please mind my lack of car lingo.

I am changing the water pump and thermostat on my e36 328i coupe.

Upon removing the radiator ect i have come across a sensor or plug on the right hand side wrapped up in insulating tape!!!??? No idea what it does or if it is needed, the wire runs up to the top right cluster where all the light wires go to if this makes sense?

Heres some pictures thanks for any help much appreciated