Instrument Panel Lights Dim

It's likely the bulbs have blackened with age. You can get brighter bulbs (use Sylvania #2825 if you want to keep the white or bluish-white illumination, or #2827 if you want amber or green illumination; you pick white/bluish or amber/green by keeping or deleting the blue plastic balloons surrounding the bulbs in most instrument clusters). Also keep in mind the instrument light rheostat built into the headlamp switch will tend to corrode and build up resistance over the years, which will dim the dash lights.

The "LED bulbs" aren't dangerous to use inside the car like they are outside in the car's safety lights (brake, turn, marker, etc.), but they also don't work very well because filament bulbs send their light out evenly in all directions, while LEDs emit a very one-directional beam so you wind up with bright and dark areas in the dash.