seamaster:
On different note: Is there some PGN that reports bilge pumps cycles in the Nmea 2k?
There is no PGN for that. For your own system you can use e.g. PRN 127489 "Engine Parameters, Dynamic" and show it as second engine instance and use "Engine hours" parameter. That PGN is so common that MDF:s can show it. But this is of coarse very confusing way.
Right way would be to use some of reserved proprietary PGNs (like 61184 - 61439), but then you have to also build display, which can parse and show that PGN content. On single frame proprietary PGNs you have 6 bytes data, which you can freely define.