Sending unit

Dana67Dart said

Be carefully putting the float in.

The copper brass mustang floats are kind of thin. I used to roll them into the Shepard's hook but now I spread the hook open with a tool.

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Yep, all the brass floats are thin where that groove for the hook is formed. They tend to crack right where the end of the hook lands.
The seal can be ordered through your local NAPA store if they don't already have it on the shelf. I think it was between 7 and 9 USD but that was several years ago.