HELP WIRING AMP HOUR METER

I agree that in principle it all sounds pretty basic. And on my previous travel trailer, I had a simple in/out ampmeter installation. However, this motorhome is a level of complexity higher with the onboard generator, inverter, and then the engine altenator. There just seem to be additional cables in the back of my RV/battery compartment that in my head I can't make the leap from their diagram to my physical installation. The comment about being able to only measure when boondocking is a good one, but why go to the effort if you can't see what your onboard charger or the altenator is putting into the bank.

A for instance question: the bonding lug to the chassis, where does that tie in the ammeter diagram?

Thanks,

Greg