On my N38 with a Ford Lehman 80 its the other way around.
The left is Gearbox oil pressure and the right one is the engine oil pressure.
According to the Nauticat manual the normal engine oil pressure is between 50-57 PSI and
the normal gearbox pressure is 106-136 PSI. So it makes sense that the left is gearbox oil because the right one can’t show the high gearbox pressure.
Ingvar in Sweden