OK. Found the A4 wiring diagram. It shows the pressure sender, a level sender and the 27010-1038, "WARNER,OIL LEVEL. So, I think it's a 'language' thing: 27010-1038, " SWITCH,OIL LEVEL" is the pressure sender and there is no 'level' sensor on the ZN1300. Clear as mud.
Bucko that part "25025" looks like the oil level warning relay that sits under the tailpiece of my ZG, although the pic isn't that clear.
Kawboy that level switch doesn't look like the one I remember in the sump of my ZG, I remember it being a taller, larger affair with the caged float not dissimilar to a carburetter bowl float. The ZG & ZN shared the same engine architecture ...strange
Ok so I found the oil pressure switch, or rather where it should have been. There is a plug in the port. The 27010 part is just a wire. But it's a way for the signal from the oil level switch to exit the case.
See my other post. I found where the pressure switch should be port is blocked off. The 27010 was def not a pressure switch which is why I was confused. Its just a part for the signal to exit the case.