I don’t know for sure on early a’s, but the replacement senders on later years are designed differently than the OEM ones. The replacement ones are square in shape (the wire wound part) and are linear. The OEM ones are more of an hourglass shape and are nonlinear. You can’t really adjust the float to solve the problem.
I bought a Meter Match and got mine working pretty good. I also built a calibration box to calibrate the Meter Match. I can help you with it if you need & send you the box if you want.
There are a ton of threads on this. I would read up on it here. I learned a lot from them.
