Bulb out most likely. Easy to replace, lower the steering wheel, few trims and the dial surround off with a couple of screws, 10mm bolt, pull clocks as far forward as you can, hand round the back, pull out speedo cable and a few multiplugs and then the clocks will be out. Take the bulb down to the motor factors, think its a T4 or something but i cannot be 100% sure.