Hi dean
My gauge was ok, it went down to just below the 1/4 full before i filled it up again, it did have a moment when it went back up from 1/2 to 3/4 for about 10mins on way to stoneligh but after it settled back it was ok.
Not sure what tank ive got but its supposed to be a ford escort mk5/6 (original tank from RH), looking at the pump/sender they look the same.