Sounds like there's something amiss with your fan switch, and it may be shorting causing the fans to run constantly. I'd check the wiring for the fans first, and then investigate further from there if necessary...
the temp and fuel guages maybe down to quite a common problem on this forum-- the voltage stabilizer for the fuel/coolant guages located in the dash may well be faulty-- its available from audi and easy to fit once you have removed the pcb board from behind the dash which is the time consuming bit good luck
A forum community dedicated to all Audi model owners and enthusiasts. Come join the discussion about performance, maintenance, troubleshooting, modifications, classifieds, and more for your favorite models!