Joe is correct. I forget, the earlier MBs have the big analog clocks that are backlit with the 2W bulbs that illuminate the other gauges. The digital clocks (like in my ML) use the 1.2W (or 1.5W bulbs) that are also used for all the warning indicators.

__________________
2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car