On the W201 (190E/D) the plastic lens is held in place with small plastic glue "welds." A sharp No.11 X-acto blade and a few minutes dispatches the welds in the black trim rim. Once the lens is off, there are a couple benefits. If you install white dial faces, it's now possible to "tune" the speedo, tach with the cluster in place. It also makes installing the cluster rings easier.