What year/model? I've worked on and swapped a bunch of 5.2 and 5.9 magnums. I've never ran across a sensor like you've mentioned. But mopar has done some very odd stuff!
I did a quick image search but can't find a pic of it. (non of them had it)
It is a single wire connection that has a pin in the center and had a squeeze to release type end on it.
I know I'm not confusing it with another motor because I just saw it again when I pulled to header on that side to fix a leak in a tube.
