Trying to get my interior issues all sorted out...

Problem is my cluster is VERY dimly lit. Not the best photo, but you get the idea...The bottom half has little to no illumination at all.
Pic shown after the cluster swap hence the wrong odometer...



1) I have replaced all bulbs
2) I have switched clusters
3) Replaced rheostat and turned it. None make much difference.
-- The top half is lit about twice as much as the bottom is. I can barely see the bottom half at night...

Any ideas what could be the issue? All the cluster items function perfectly...It is just the lighting.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k