olds40316mm 10/13/2012Sounds like the light bulb burned out,Because it's such a nasty job I replace all the bulbs in the instrument panel with new one's instead of just the bad one because you are right there and the bulbs are cheap compaired to the lobor cost
rick 10/13/2012Sorry to say but the dash cluster is starting to go bad . Little by little other gauges will quit ( oil press, temp , ect ) This is a problem with GMC /Chevy . There is no recall on it . Plan on a new one sooner or later . Most parts stores can order one for you and it takes a bit since the mileage has to be programed in to it to match your mileage . Cost is about $400 . I did the one in my 2003 Chevy 3500 HD . Took it to the dealer and had an OEM cluster put in for Just over $300 . Keep in mind I am friends with the owner but some times the dealer is still cheapest .