Just to double-check, when you turn the key on the car, all the guages, including the gas guage, does a sweep all the way to full, back to empty, then to current reading. Is this what she was talking about?
Also, the gradual metering of the guage upon acceleration and deceleration almost sounds normal. As much as 1/4, is this only upon hard accel/decel? Also, on our cars, you'll notice in on gradual turns to the right, ar maybe it was left (confimation on that, please? )
The sender going out causes the guage to be much funkier than what you describe. I'd just hate for you to do an unnecessary changeout, then experience the same thing.
SC is me spinach!
Black 2000 SSEi
All stock so far, except for an oversized idler pulley.