After watching the expensive and labor intensive installation of the FloScan NMEA 2000 units and the associated NMEA cables, connectors, resistors, terminators etc. it was indeed painful to have the FloScan output fuel data not appear on our Raymarine E80 multifunction display unit.  The Floscans work perfectly and we had fuel data on the Floscan LCD screens.  Derek from Alcom Marine verified the NMEA connectivity between the Floscans and the E80 display unit even though Raymarine and their techs seem to be in the dark regarding NMEA devices interfacing their E80 equipment.  Joe Dydasco of FloScan has been very helpful and he is sending us a Floscan Flotron display unit so that we can access all of the engine and fuel data.  FloScan also put us in touch with Joe Ferrara, (joe@shipdriver.net) who runs “HIS DOGHOUSE CHARTERS”, (see a link to his site under the MARINE SERVICES  section).  Joe is  very savvy when it comes to the new generation of electronic displays and he is independently  testing the combo of Raymarine displays and the FloScan NMEA 2000 units.    Again, after verifying the the FloScan NMEA 2000 units were correctly connected to the Raymarine E80 display  and toning out the NMEA cables, we still were not receiving NMEA data on the  E80 display.  Alcom decided to switch  the output from the FloScans from our “Repeater” E80 to the “Master” E80  and instantly the combined GPH value appeared on the E80 “Master” display  If this information regarding using only the master E80 for connectivity is in the Raymarine documentation, we could not find it.  We also discovered that the E80 does not recognize any other NMEA sentence data from the FloScans and you cannot see individual engine GPH,  just the combined total of both engines so I guess Raymarine thought all boats only had one engine.  At the start of this process, we upgraded the Raymarine E80 software to V4.29 and regardless of what Raymarine advertises about PC connectivity using their RayNav 6.0 navigation software, V4.29 will not interface a PC until the software is modified later this fall.  I believe that Raymarine is aware of the bugs and glitches and they are working on fixes and upgrades.  The biggest thing I have learned throughout this process is not to be among the first to try the latest and greatest electronics and to sit back and wait for the 2nd or 3rd version of software prior to buying.  So until the FloScan Flotron meter arrives, we will use the combined GPH data from both engines in conjunction with the Tachs and GPS to determine the most fuel efficient trawler and cruising speeds.