Please sanity check my proposed system

[bobbob]

Ahh, I got it - thanks for the clarification. Unfortunately this sort of negates the value I was considering for the i70 (the ability to talk to both SeaTalk and SeaTalkNG)

Can I use an E22158 (SeaTalk1 to SeaTalkNG converter) followed by an A06045 (SeatalkNG to DeviceNet cable) to effectively connect my ST40 to an NMEA2000 backbone?

This seems like the best way to go, then I will have full flexibility to choose any NMEA2000-compliant instrument gauge.