Nothing in your driver's manual? My ex-'s Malibu's manual had the part/bulb # for any bulbs in the speedometer that required replacing. It's like a T5 bulb or something. Since you said dash, I wasn't sure if you meant the radio controls or the HVAC or the speedo. The first two get to be pretty complicated and I'd only suggest it if you know how to solder stuff. I don't, so I leave that stuff alone and will probably just do a part-to-part switch when it does go out!