You have to take the instrument cluster out, just change the lightbulb (cheap). The instrument cluster is held in place by pressure only but, if it has never been remove before it may be hard to pull out and may have to use the tools MB uses (you can make your own). You also have to "loosen" the speedo cable. If you want step by step procedure do a search on the subject. I am almost 99.99% sure I'd seen it here before. Or, buy the CD. You will get your money back with this job alone.