Oil Pressure Sending Unit

I started up my 1970-318 Duster and the P.O. put a tube on top of the oil pressure sending unit and then proceeded to plug it with a screw. Needless to say, oil all over my garage floor.

That oil sending unit is broken, correct? Otherwise it wouldn't be spewing oil everywhere. Isn't it supposed to just have a wire on top of it that goes to the oil pressure gauge?

Curious if anyone has some pics of their sending unit.