That would be right in theory, but most fuel cells I've seen (no expert on 'cells) had the fill/ sender/ etc ports on top. And, it just might be that the bolt pattern/ etc fastener for the sender (if on the side) would prevent you from turning it upside down.
And of course you'd have to rebend the arm
That is part of the reason I asked Brad for a photo/ brand/ part no/ etc of the cell/ sender
