I have a 1983 240D. I took out the instrument cluster to replace some bulbs and replace the clock. When I reassembled everything the temp and fuel guages are jumping all over the place, particularly on acceleration. From previous posting, it sound obvious that it is improper grounding. My question is, how do I correct this? It sound like I might have cracked the circuit board, can this be repaired. Is it easier and more effecient to run a wire from the back of the instrument cluster, the metal housings for the fuel and temp guages and run that to the same ground that they currently have or a new ground? I am sure that this could be more trial and error, but I would appreciate any feedback/experiences.