Rally Dash Wiring Harness Questions

The standard panel shown above shows inst' regulator and brake warning and oil warning getting power from a single switched 12 volt circuit. 3 components on one switched 12 volt circuit. That is different from 71 standard and rally panels. I'm almost certain that if you checked back to early A body, most anything you would find inst' voltage regulator on 1 circuit and warning lamps on another. Warning lamps thru 71 model gets it power from a different circuit ( turn signal? radio? I forget ), A fused circuit.
Inst' voltage regulator was not on a fused circuit. It's only protection was fusible link before ignition switch. Note that a oil waning lamp does operate on 12 volts. Oil gauge does not.
In a rally inst' panel, one 12 volt switched wire at 10 o'clock position ( circuit boards never changed ) of round connector feeds nothing more than the inst' voltage regulator. And it was tied to black or blue with white tracer after ignition switch. It's single warning lamp was on a fused circuit.
If my memory serves, that warning lamp is routed to ports 5 and 6 of the round connector. I will look again this afternoon for where this 12 volts originates.