Originally Posted by
piratius
The most likely culprit is that the aftermarket senders have the float arm too short, or that their rheostat isn't calibrated linearly (or non-linearly) like the OE units.
I said it first :-P
I think a longer float arm would also help "slow" down the issue without needing to resort to buying an OE sending unit, but that's a stop-gap. It doesn't mean that it would fix it 100%. If I ever have to pull the tank again I'm going to try doing it!
-Brad