1990 fuel sender 4.2 Quattro

[Jonsie]

Hi from new member
Iam right on buying this a8 Quattro it's a real nice car but needs fuel pump and offside tank sender I've located new pump and offside sender but can not find a sender for the near side , could anyone enlighten me briefly how the 2 senders work as they have corroded with condensation as car has stood for a while or if anyone knows where I can get any of the above
Many thanks Ian