instrument cluster light

[Joan Kotjarapoglus <jkot+@pitt.edu>]

The instrument cluster lights on my 87 5000cs quattro will all go out
while I am driving down the hightway, and othertimes will simply not come
on at all.  Local mechanic at salvage yard who is very good with audis has
replaced the turn signal/headlight assembly and the dimmer/computer
controller in the center of the dash but it has not curded the problem.
Has anyone experienced this problem and, if so, what was the cause.
  Thanks once again for listening and helping my in keeping my quattro
alive and well   George k      jkot@pitt.edu