Old school headlight switches used to have a variable resistor that would adjust the dash lights from bright to dim and vise versa.
The switch in my brother's '78 Grand Lemans got baked so the dash lights wouldn't work at all until I found another switch from a salvage yard.
I'm not sure if the modern headlight switches work the same way or not, but just throwing that out here as something you might check. They may utilize a seperate dimmer control for the dashlights/dome light.
I would see if I could easily pull out the speedo to check the bulbs though.
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