I don't think any of your problems are serious. If it starts and runs OK the fuel Pump is good. I dont have the service manual for your vehicle so can't say exactly where to look for unstable fuel gauge and oil pressure gauges. For peace of mind you might test with an external oil pressure gauge to make sure it's OK. My experience is that Audi has some problems with sensors. The oil pressure sensor is screwed into the engine block and the fuel sensor is likely in the gas tank. These are quite easy to check in the shop and it shouldn't cost much to do so. Your oil drain plug may just need a tweak but don't overdo it. It might also need a new washer if that doesn't work.
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