Quote:
Originally Posted by fred98050
The 300D and SD might be different, or some headlights might differ but today I went to look at a 300SD with euro headlights, the owner has done the upgrade himself and basically, T off the vacuum in the engine compartment to a check valve, to the switch and from the switch to the headlights. No reservoir and the system works great.
The install is following this diagram (posted in this forum):
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they are different, becuase the cluster was a completely new design on the w126 chassis, and included a vacuum tube going into the economy gauge (not present in 1991+ models), which could be used for the vacuum switch.
for the w123 you have to get crafty and choose another vacuum source, which is what mbeige did by using the brake booster as a source.