Spent all day yesterday putting this together. From left to right: house battery switch, charging relay, engine battery switch. The house battery runs through a shunt which measures current in and out.
One of the white cables carries the remote signals for the switches & ACR, the other carries data for the Vessel Systems Monitor on the new panel (shunt measurements, voltage, and temperature).
If there's a problem with any of the remote switch connections, the whole setup can be switched manually with the yellow knobs on the tops of the relays.
This replaces my off/1/2/combine battery switch.