hi guys, I've just recently joined the Audi club and have just brought my 1st Audi. It's an A4 1.9TDI 2000 facelift model. I don't know much else about it but i do know my petrol needle doesn't seem to be working properly. i put in a full tank of diesel and have covered 200miles since. the needle is still showing a FULL tank. also when i turn the ignition on the needle shoots to full straight away. normally it should take a couple of seconds. what could be the fault??? all help appreciated.