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The point of dimming the various dash lights when the headlights are turned-on is to NOT DESTROY YOUR NIGHT VISION. Your pupils dilate in low-light conditions. They contract in bright light. When you're looking out into darkness, somewhat lit by your headlights, you want your pupils dilated to bring as much light as possible onto your retinas--so you can still see where your headlights are not directly pointing--to the sides, and further down the roadway. Bright dash lights cause your pupils to contract. The opposite of what you want, and what is "safe". Of course, you could CLEAN ALL THE DASH LIGHT LENSES, and REPLACE ALL THE BULBS WITH NEW INCANDESCENT LAMPS (direct replacement, not cheap-junk Chinese LEDs.) I guarantee that any original incandescent light bulbs from the 1990s are worn-out even if they still "work". You'll see that the glass "bulb" has become silvered, there's plenty of light being generated by the filament, but it doesn't get out of the darkened glass bulb. For that matter, it's EXACTLY the same with incandescent headlights. "New" headlights with clean, shiny, non-corroded reflectors and non-silvered glass will be brighter at the same voltage than "old" headlights.