Help with fuel guage PLEASE!

All aftermarket sending units are linear, so they won't read right. Also some of them have the pickup tube either too high or too low (if too low the sending unit won't seal). Only way to know for sure is to pull the tank and check. It's a pain. It sounds like having the fuel gauge read correctly is very important to you. To achieve that you need to search on here, ebay, etc for an OEM or NOS sending unit.

You can get floats and screen/sock for them on Amazon or take them off an aftermarket sending unit.

Here's 3 places that rebuilds them in case you have an OEM one you can rebuild, or maybe they have some rebuild OEM ones in stock:

Fuel tank sending unit rebuild service

Fuel Senders

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Rebuilt Fuel Sending Unit Specialist