So the water pump on my '95 E320 wagon died. I got a new one and after I installed it I noticed something different. Attached is a picture of the old pump, which has a third, sensor. The large, round, black, two-pin closest to my index finger. The new pump has this area sealed shut so this sensor cannot be installed. What does that mean? Wrong pump (how can that be?) or maybe its not needed?

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