Re: 69 console gauge wiring
According to my diagram, most of the orange underdash wires are all on the same circuit - cig lighter, GB light, under dash courtesy lights, dome light (not on a conv though), rear console light, and a clock power wire. These should all be hot with the key off. You might put a test light on it.
There should also be an orange going to the brake light switch from the fuse panel, and one from the headlight switch to the fuse panel.
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