Sounds like the light bullb\bulbs for you gauger cluster is out. You will have to remove the cluster to get to the back of this to change the lights.
The instruments light dim for night driving when the headlights are turned on. Check to insure that your dash dimmer switch is on high. If it is, then you have a problem with either the dimmer switch or the wiring.
I'd be suspicious of the dimmer switch or a wiring connector between the dimmer switch and the headlights.
Check dimmer switch.
The headlamp dimmer switch is mixed in with turn signal lever, push the lever forward for 'brights' The instrument panel dimmer switch is just right and down from the steering wheel, left of the radio it looks like the wheel on your mouse but bigger In 1999+ models, the instrument panel dimmer is to the left of the steering wheel - still looks like the wheel on your mouse.
Left button sticking out from the instrument panel
A rheostat is a variable resistor. Examples are a volume control knob or an instrument panel dimmer switch. As the resistance is increased in the switch the volume will lower or the instrument panel lights will dim.
turn the dimmer switch up.
On many cars, there is a dimmer switch which controls the instrument panel lights. If this switch is turned all the way, it may cause the overhead light to come on. The overhead light will then stay on even after doors have all been closed. Find the dimmer switch, close the doors, wait 30 seconds, and then turn the dimmer switch.
This happened on my car-it turned out to be a blown headlight fuse(15amp) and the hazzard switch on the left side instrument panel. Went to a junk yard and bought a new switch and replaced the blown fuse and ta-dah taillights I also replaced the dimmer switch also.
The dimmer switch if for the instrument panel lights. The high and low beam switch is for the headlights. On most older cars the high and low beam switch was on the floor. Most cars have it on the turn signal lever now.
It is probably either the switch or a bad ground somewhere. Try the switch first. On my truck the switch itself is going bad. most of the time if you just keep turning the switch on and off then it will come on. If not you'll have to replace the switch. Logic tells us that IF the headlights [high and low beams] are WORKING, then the dedicated HEADLIGHT dimmer switch is OK, as the headlights are the only thing that dimmer switch controls. The HEADLIGHT dimmer switch is ONLY in the headlight circuit, not the other related circuits such as instrument panel and parking lights. On the other hand, there is a SEPERATE DIMMER switch, usually in the MAIN light switch, for controling the brightness of the instrument panel lights, and as answers 1 and 2 suggest, the problem is more likely in the main switch which controls the instrument and parking light circuits, but again, not in the switch dedicated to controlling high and low beam headlights.j3h.
No a switch just opens and closes a circuit. A switch can be replaced by a dimmer switch. The dimmer switch will fit in the same enclosure that the switch is removed from.