Hi, I have a 2000 Camry LE. The Fule and Speed Meter on the left are lighted in the night (when head lights are turned on). But the Tachometer on the right is not lighted. The fan/airconditioner buttons are lighted also. But radio buttons are not lighted (although the radio works fine). Anyone has any idea on what's wrong? Thanks.

There are a number of bulbs inside there. Clearly a couple of them are burnt out.

Your aftermarket Haynes or Chilton manuals will show you how to take your instrument cluster off...but it's pretty obvious once you start un-screwing the mounting screws. Your cluster will then be removeable as well and the bulbs mount in the back of the cluster (1/2 turns).