Honestly, Best in Class for RVs, IMO is Blue Fire. It was developed specifically for diesel trucks and motorhomes. My rig has the J1708 6 pin gray connector for the ECM and I use the J1939 adapter to plug directly into the BF.
It communicates directly with my iPad gen 6 via Bluetooth, is mounted on my dash and can be configured with whatever data you want as long as it’s available from the ECM.
I too had a SG-D and it was hard to read and would only show me 4 variables at a time. Plus, as a guy I tend to be more visual/graphics oriented vs. text.

Finally, I trust the data from the ECM vs 20 year old gauges, but that’s just me.
10/10 would recommend.