The dimmer rheostat on the light switch stalk is the most common cause. Try twisting the knob back and forth vigorously to see if you can rub away some of the corrosion. If that doesn't work, get a mirror up under the dash and look at the back of the light switch- - - -some of them have a built-in fuse for the dash lights. Last resort is a new switch.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!