The petrol gauge on my 2003 A4 Avant Estate B6 doesn't work (occasionally it springs into life) - I just fill up before I get past 230 miles on the trip.

My internet investigations seem to suggest that the sender unit(s) are under the rear seat. I have had a look and there appears to be ... lagging/tape over where the access point should be. It is definitely meant to stay there and I was reluctant to start trying to rip the stuff off.

Intermittent life (albeit rarely) suggests some hope of repair or is it a 'replacement needed'?