When/if you change the sender unit, it screws into the that tee fitting. The tee fitting rotates, so you need to be sure to hold it with a wrench while you remove/replace the sender. If you let it spin, it can start leaking, or it can screw up the oil cooler line...both of which are a MAJOR PITA. Mine started leaking in a big way (flowing out, not dripping). When I was trying to find a replacement, it was almost impossible. It was back-ordered forever. My dealer searched, and found only ONE in Wisconsin, that was available only because the woman found it on the wrong shelf!!!
Only other option would have been to bypass the cooler, which has been mentioned in a few other threads.