The color of the back part of the cluster is a light blue. FYI, I picked up a used cluster and installed it. Just as suspected I inherited the other car's mileage so I swapped out/in my blue cluster and got my miles back. However, I don't think I noticed any change in the speedometer with the new/use cluster I installed. Therefore, I don't think my speedometer problem is in the cluster. I then changed the speed sensor in the differential and that was not the problem either. My speedo still reads slow. Any other ideas would be appreciated.