Hydraulic steering with a BA125x7-BJ steering ram is 7.2 cubic in. Pump is no longer good. This is a twin diesel engine boat, dual rudders one steering ram controlling both rudders.
Sounds like the best option would be the NAVpilot 300 with a 12v reversible pump. If you don't already have a good source of heading on the boat, I would get the SCX20 for the needed heading over using a PG700 flux gate.