Add the readings you are missing to your NMEA 2000 network. These Yacht Devices sensors and instruments measure temperature, atmospheric pressure, humidity, exhaust gas, battery state, tank levels and rudder angle, and show them on any compatible chartplotter or instrument.
Popular choices
Battery Monitor (YDBM-02): voltage, current and state of charge.
Tank Adapter (YDTA-01 / YDTA-04): turn resistive senders into digital tank levels.
Thermometer / Barometer / Humidity (YDTC-13 / YDBC-05 / YDHS-01): environmental data on board.
Rudder Adapter (YDRA-01) and Voyage Recorder (YDVR-04) for navigation and logging.