My gauge lights will not brighten or dim. Is the rheostat usually the problem?

 

Hi JD

That could well be the Problem and Twisting it back and forth a few times, can quite often put it right

 

Little shot of contact cleaner and some turning restored mine to 95% effectiveness. On my 90 I was able to get a good shot at it after removing the interior light to the lect of it and moving the lights black housing out of the way a bit.

 

, bypass it, when do you ever use it?
Their pretty dim at the best of times.