Well i have had my sensors fixed for 3 full tanks now and not an single issue.
When i first got the car and all the lights were working (for the first 5-6K kms) i also found the fuel level reading very inconsistent, from full tank to empty, this issue seemed to have been fixed also. This might of just been me though.
Brighton Nissan - Quoted 7-10 working days to have new parts in, I was called withing that time and they had the car fixed within a week of parts arriving.