I just installed seaboard marine vessel view on my Cummins 5.9 . I had them add a nmea 2k gateway to their display this way I can plug into my nmea backbone , and see the data on my tzt3 . I see the can bus in my sensor list , and I see the gauge symbol in the home screen . The symbol is grayed out though. Was never there before so something is being seen just can’t get the data up . Any help out there ?