1993 BMW 320 Steering and Gas Guage

The power steering reservoir is located down low and in front of the left front shock tower. It is a dark brown cylindrical container with a round black plastic screw on cap and probably will require a long funnel to fill. The fuel gauge problem could be indicative of two issues, first is deposits on the sending units and second a possible internal fault in the instrument cluster, or perhaps a loose connection or ground. Does the idiot light for low fuel still work? If I had to start somewhere, I would replace the fuel sending units as there is a bulletin regarding an upgrade to deal with "oxidized" fuel additives that cause said deposits

Thank you sir for the information its a big help, yes the idiot light are still lighting and gas is full, fuel additive do you have any idea if available here in Unite Arab Emirates? thank you more power to this site.....

Thanks.