66 Barracuda radio wiring

I appreciate all your help. I did find the part in the service manual about the condenser in the back of the instrument and thank you for confirming that. Incidentally I think in the manual they refer to the regulator as a 'voltage limiter', I guess to differentiate from the actual VR.

Yes, I know about the voltage regulator there, all my gauges died at some point, and I took the thing out and converted to a solid-state 5-volt regulator and now everything works again. The pain was that the board traces and socket pins had rotted out and it took me a while to solder things back together.