The most important point to remember about the EMU-1 is that it is the senders and gauges that are important when trying to understand compatibility and not the engine model / manufacturer. This is a helpful article that describes this in more detail:
The EMU-1 will output standard NMEA 2000 engine, transmission and fluid level PGNs that will be understood by any NMEA 2000 MFD.
Points to check are that both engines share a common ground and that each engine doesn’t require more than 3 gauges and 2 alarms to be monitored. One of the other benefits of using one EMU-1 per engine is that the battery voltage of each engine can be transmitted on the NMEA 2000 network.
Please note that an NGT-1-USB will be required to configure an EMU-1. For many customers, leaving that NGT-1-USB on the NMEA 2000 network after EMU-1 installation is beneficial as it can be very useful for diagnosing NMEA 2000 data issues (when used with our NMEA Reader software application) and it can be used to update the EMU-1 firmware and tweak the configuration if required.