The gauge has a black and red arrow. The red arrow marks the max pressure you saw during your run. The black gauge should return to 0 when you shut down.
With clean, new filters (all filters including on engine), go out and run at cruise RPM for a minute. Idle back and make note of the red arrow value.
Then go out and run WOT for 30 secs or so. Idle back and note the red arrow value.
According to Seaboard, when the red arrow reads 7 over the clean values, you should change your first Bulk filter.
When it reads 7 over again, you need to change your second fine filter (and on engine as well).
If the guage keeps clmbing into the red zone and keeps going up....then you have a fuel restriction problem.
Mine reads about 6 with clean filters after a WOT run. So at 13 I would make a change.
BTW, you have a very pretty boat.