First check to see if the screw heads are the bow tie shape (clutch head). If so, you need to locate a driver bit. Basically you pull the screw at each of the four corners and being careful with any wiring etc that comes off the back of the gauge, you should be able to see the light socket. The bulbs should be marked with a size. I saw some similar sized bulbs at the Ace hardware the other day. It's all pretty strait forward.
