I was changing my oil filter today on my 1993 300CE Cabrio,,,and I accidentally knocked my hand against some kind of sensor. The sensor (I think the Coolant Temperature Sensor????) has a blue-colored base, which just broke-away in my hand, leaving the two internal wires exposed.

Here is a couple of pictures of the thing I done busted:






I feel pretty dumb here,, but is this the coolant tremperature sensor or something else? I'm having trouble finding the part # to replace this so any help would be um,, helpful.