Fuel gauge issue....

[A80Avant]

Right

i managed to install the controller for the wideband lamda, and just as i was in the middle of testing it, as i turned the key to see if i had the ignition power cable correctly connected, all of a sudden the board comp. issued a low fuel warning and the needle went to zero.

as i turned the key back to off, the fuel gauge needle went all the way to the half tank area,which is what i have in the tank actualy!!!

obviously the power there is somehow reversed!! how did i do that?/?? i wasnt even near the cables that go to the cluster!!!

I disconnected all connections i already had made,and it still persisted...

anyone has any clue what to do?

out of all the cables on the blue plug on the cluster on the violet/black has permanent power even with ignition off,but when turned to on, it still has power,so im not sure if that has anything to do with it...

heeelppp!!

[A80Avant]

sender at the back was fairly recently replaced,so i doubt that this has anything to do with it.

also noticed that people had that in the past,but noone really managed to find the problem...

[A80Avant]

gone to the car again.

really i can find no clues of what the problem may be.Could this be related to the instrument cluster itself? it is very weird...i checked all the earths again and everything was fine. Disconeconnected various items and it didnt make a difference...

[A80Avant]

well, it fixed it self on its own in mine....

but i will get a second hand dash,just to have as a replacement..