I have an 01 Audi S4, it's doing this f unky thing with the oil temp gauge, it will be at 150 then all the sudden go up to the red line then drop back down, also the gas gauge is not reading the gas level right, it said I had no gas when I really had half a tank. Anyway, sometimes it does this, then sometimes its fine. We checked the instrument cluster and there are no DTCs, anyone have any suggestions? Thanks!

Its probably the voltage stabilizer that needs replacing as the name implies it stabilizes the voltage to the instrument pack if it goes it would cause the symptoms you describe.I have an A4 UK spec that is what a Haynes Manuel comes up with in the UK version its incorporated in the printed circuit itself.Regards Mick or as you say " Have a nice day."

For the gasoline you could try some fuel injection cleaner (you might have gotten some bad gas somewhere) or even Sea Foam.

For the oil, are you filled up on it?