The steering wheel needs to be removed and then the instrument cluster can be pulled on - pressure fit - need to disconnect oil gauge, speedo etc to have complete access - good time to replace bulbs and maybe get instruments refurbished. Good luck. There are a number of good manuals: Chiltons, Haynes and MB Chassis & Body manuals plus MB Service manual for V-8 engines: M116 & M117 (I got my MB manuals on eBay).