The bulb is probably burned out.
I don't remember the model # .... but any competent auto-store clerk ought to be able to look it up. The bulbs are quite small.. about a 1/4 of an inch in diameter and maybe 3/4" tall.

To replace the bulb, it's a 15-minute job at the most.

Remove the instrument panel, turn it around and remove the little bulb holder by twisting counter-clockwise. Swap in a new bulb, reassemble and you're done.