First of all some general info.
If you do not have an owners manual: can be downloaded from my website below. Same is with online wiring diagrams and repair instructions. Have a look at my website. It has links to all important E32 websites all over the worls.
1. fuel level: clean the sender unit
http://shrubbery.student.utwente.nl/...el_sender.html
2. steering play:
go to my website and then to e34.net, there is an instruction, or on Johan's page
http://shrubbery.student.utwente.nl/...djustment.html
But there is another screw inside the cabin on the steering column. If it clunks when you drive over bumps and the steering has play, adjust this screw. The instrction is in German, but the pics explain it. For the text use translation program altavista.babelfish
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http://www.7-forum.com/modelle/e32/lenksaeulenspiel/
3. SRS light: that is a dealer only item. Must be reset with a special tool. You could buy one, but it costs about 120 $ and not worth to use it once in every few years. Go to the dealer and ask for a reset and a readout of the trouble. On that occassion I would recommend also to ask them for a readout on the diagnosis DIS to check for stored fault reports on the car. Then you have the details, after that they can reset/clear the faults. You can do that also DIY, when you buy a PEAKE tool. Very handy and useful and saves money and time to drive to the dealer.
http://www.peakeresearch.com
Also use the search engine on top of this page and search for online ETK. It is also shown when you enter the website bimmer.info
This is the online spare parts catalog. You can enter your VIN of your car and search for part numbers and prices. The drawings are very useful for DIY. If you click on them, the enlarge to explosion drawings and it helps a lot when you want to repair or disassemble somthing.