My odometer finally stopped working! Also more questions

[86560SEL]

Did a search and found SOME info, but not nothing really that helpful and I have a couple of additional questions anyway.

Well, out of all of the Mercedes I have had, I finally have one that the odometer stopped working on... on my '88 W126. It had to of stopped working the last time I drove it, which was this past Sunday. My fuel gauge is not that accurate, so I use my trip odometer as a "guide". I guess that was a no-no, because it probably helped it stop working sooner than it would have where I was resetting it. ? Anyway, no the trip odometer AND mileage odometer have stopped. Its now on 156,539 miles and stuck as of today. I want to get this fixed asap, but wondering whats the best way to do it and what will a indy shop normally charge for this and what parts do I need and where can I buy?

Also, ALL of my warning lights EXCEPT the battery, anti-lock and check engine lights are fairly dim. Battery, anti-lock and check engine lights are bright. Does this sound like those other bulbs may need replaced, or is that some other issue? I thought while the cluster was out, it would be a good time to replace these warning bulbs.

My SRS indicator light dont even illuminate.... either a bad bulb, or someone disconnected the system?

Also, while my dash illumination bulbs are fairly bright, I would not mind upgrading to those LED bulbs everyone has been boasting about while the shop has the unit out.

Thanks in advance.