Requesting further clarification. I am trying to order this sensor from FastLane, but want to make sure I DON'T order the one for the temperature gauge. It's confusing because this part is supposedly called "water temp sensor" but they also sell a sender, which tells me it's for a gauge. Am I wrong?

Which one do I actually need?

WATER TEMP SENSOR

ENGINE TEMP SENSOR

__________________
08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280