In the end having seen both A1 and A1R schematics, the A1 and A1R are not all that different electrically. The biggest visual difference is that they went from the sometimes problematic circuit card type PDP to the off the shelf sealed relay modules. The relays contained within are basically the same and service the same circuits. They also somewhere in the end of the A1 shifted to the integrated gauge module and bussed gauges, so sadly if your gremlin are gauge related, it may require a whole controller vis a single gauge to fix… Not so visible is the 260A alt on the A1R which I am sure cuts down on battery and charge related issues…
The early A1 schematic is available here…