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On the spare 1981 cluster I have, many things are different from your later model one, but the red circled female spade connector by the clock/tach hole is soldered to a circuit board trace that connects to one side of the second bulb from the right in your photo - the one that's been removed.
The other side of that bulb goes hot with ignition on, so the spade would be connected to a switch that grounds to turn the bulb on. On my Green Book wiring diagrams that is shown as the Diesel glow plug indicator light (European cars). So it does nothing in the case of a gasoline engine, and I doubt there is a wire in the harness for it.
Your old clock and new tach get power and ground and lighting from the little pins sticking out of the board.
See the male spade terminal at the far left of the board in the pic?...it's connected to that last bulb beside it, the automatic trans 'OD off' arrow. It gets 12V when the OD is manually locked out. The other side of the bulb is connected to the CB's ground tracing.
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Bob (son's 81-244GL B21F/M46, dtr's 83-244DL B23F/M46, my 94-944 B230FD and 89 745 (LT-1 V8); hobbycar 77 MGB, and a few old motorcycles)
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