Non Rallye fuel gauge either full or empty

Pulled the sender out of my tank today and wired it to my gauge to double check the sweep..it was not my sender {ohms are right where they should be} So when I fill the tank, gauge reads full after the float drops to around 3/4 the gauge goes right to empty. I have heard the gauges can be re-calibrated but I think this one is beyond that as it will not show anything between the E and F.
Any advice?
Thanks
AL