Yanmar oil pressure sender

[Ryan Wright]

Does anyone have a NAPA (or otherwise) part number or cross reference
for the Yanmar generator oil pressure sending unit? My oil pressure
sender appears to be shot. Gauge runs all the way to the right
(highest possible pressure reading and then some) when operating.

Also, should the gauge go back to 0 when the sending unit is
disconnected? It doesn't. It does drop to between 60 and 90psi when I
press the "stop" button to warm up the glow plugs, but goes right back
to the top as soon as I hit "start". In fact, disconnecting the
sending unit doesn't seem to have any effect whatsoever on the gauge.

Just in case I replace the sending unit and that doesn't solve it, any
other ideas would be appreciated.

Thank you!

-Ryan
'86 PT-40 8V92