Depends on the year of the boat and type of fuel, as well as the type of network you have (NMEA-2000, Garmin, NavNet, Lowrance, etc); most late model gas and diesel engines (say, 2005 and newer or so) are NMEA-2000 compliant and will readily hook into a network. Older/analog engines can use interface boxes to convert the analog signal that go to your dash into NMEA-2000 compatible data.
Floscan makes a NMEA-2000 unit for diesel engines.
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