Lost the lighting on my dash

Yes, you are checking the wrong thing here, check for voltage at that wire with the headlights on, and the voltage should vary as you turn the dimmer switch, The other wires show continuity because they are grounding through other things in their circuits....light bulbs, sending units etc.
Another check - with your meter set on continuity, connect it to the suspect pin on the circuit board, and where one of the bulbs plug in, wiggle the pin and watch the meter.....