Re: oil pressure sender Yanmar 2GM
Found the answer so I figured I'd post in case anyone needs to know and searches.
There's a boot that should slid back uncovering a phillips head screw on the sender. My wire's boot had pretty much welded itself to the wire and didn't pull off without breaking the wire ring.
Turns out that part had failed, which is why my alarm wasn't working. So no loss breaking the wire ring/connector.
Thanks to Scott at AR Marine of Annapolis for giving me the answer.
Sailing the "Knot Yoars," a Hunter 31, from the Middle Chesapeake around Solomons Island.
I can keep a secret, it's the people I tell who can't.