Exceptionally good used intact rubber instrument cluster hold-in gasket. This is what holds the cluster tight into the dash. These often get damaged and the cluster housing won't stay in the dash. Hard to find good ones. Full flexible unbroken length and still soft rubber.
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W123 Instrument Cluster Housing with Good Dash Light Tunnels - USED
NOTE: This is the later style with the arrow for the turn signal lights but will fit all years. Now includes free video instructions on how to get the cluster out of the car. Super nice housing with a good clear plastic face and no scratches or face delamination.
Bypassing a Non Working Dash Light Dimmer Switch - On Demand Video
If both dash lights are not working including the lights in the upper center console the problem is most likely in the dimmer switch located on the back of the instrument cluster. This is also call the potentiometer providing variable resistance in the wiring to the bulbs.