That's interesting but activity is pretty low for NMEA 2000. For reference, check our setup:Screenshot 2025-05-26 at 8.12.29 AM.png. You should easily see 8-10x of the activity you are seeing, so something looks off.
If you see tank levels coming from NMEA 2000, it means at least some part of it is working though. Looks like you have an Ekrano, and connection is at the first port, is that correct? Where does it connect to on the NMEA backbone? Is there a terminator on the Ekrano?