The part in the picture is part of the pump. Once you remove the snap ring, there are springs and things under it. The ISS plug is located in that square section but the actual sensor is further down on the pump, right where the input shaft goes through
Here are some pics of mine. The black part in the hole is the harness plug. On the pump, you can see the harness and sensor. After thinking on it, you may be able to buy a pump half with that provision, if the other half of your pump is ok.
Just wanted to clear that up for future lurkers stealing your hard research like me...
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edit: you are looking down at the spot the arrow is pointing to. The snap ring is under that harness clip. Circled is the actual sensor
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one more effing edit:
you can see the sensor in the upper left corner. Sorry for the random pics and 10 edits, I’m just filtering through the few I took during disassembly
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Those pics remind me of somebody I watch on YT. Dude is cool as shit. He's actually out having some serious surgery right now.
https://www.youtube.com/user/click482003