Dim instrument cluster and electrical

I’m new to the forum but it seems my issues are similar to many! I have an 86 240DL.
My instrument cluster lights are really dim. Do the bulbs get dimmer with time, or might it be another problem. I was going to change them out anyway when I fix my odometer gear anyway. Additionally my overdrive pops on and off without notice every week or so, and my temperature gauge works now and then. Sort of like the car is haunted! Are any of these issues related?
Thanks
 
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