The sender and the sensor are both very close together. If I recall correctly, one angles downward, and one points forward (or maybe it's upward). I have replaced both of them in the last few months, and right now I can't remember which is which. If I am recalling correctly, the sender is the one that angles downward. I'll go out to the car in a few minutes, and look and see the number of wires going to each.
