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Same theory as Diesel Don's #2, I took some Q-tips (soaked in rubbing alcohol) and cleaned the carbon or whatever that is which gets inside the prism in my dash in both the 83 & the 84. Swapped a couple bulbs, and cleaned all of the bulbs in the cluster with rubbing alcohol. The 83's backlighting wasn't that bad in the first place, so I don't know if it improved much. But the backlighting in the 84 is ~5X better!!! My 84 also has a flickering potentiometer, but I tested the resistance on it and it isn't that bad so I left it in.
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