I was replacing the t-stat on my 1987 W124 300TD today and found that the single pin sensor next to the thermostat housing has been broken for a while. The pin is broken off and the plug has been just hanging free. I'm having trouble identifying exactly which coolant sensor this is.

I think it is 'Radiator Temp Switch' listed on Pelican here: https://www.pelicanparts.com/More_Info/0055457024.htm?pn=005-545-70-24-MBZ&SVSVSI=3393&DID=56879

Is that correct? And what does this particular sensor drive?