I was looking through an online retailer parts listings for a coolant temperature sensor and I found this 3 pin sensor I've never seen (was looking at a 1986 300E):
Part number: 006 545 42 24
I tried looking in the manuals, but I can't find information on this sensor. Does this one sensor serve the purpose of the blue (aux fan switch) AND the single pin (dash gauge) sensors?
Part number: 008 542 45 17
Part number: 005 542 10 17
I'm trying to find a way to get an additional device reading the engine temperatures without throwing off the readings on the existing thermistors. If I can combine the blue 2 pin and black 1 pin sensors into a single sensor, this frees up a port at my water pump housing that I can use to install another sensor for a completely separate device to read from.