Tanks inc Tank Vent Question '68 barracuda

That sending unit is the same junk everyone else is selling. It will not read correct level. It will fill the hole but that's about it. Also, the ethanol in the fuel will soften whatever glue they use o hold on the sock filter. So after about a week that will be bouncing around inside your tank.
There is a seller on ebay selling a sending unit for A100 van that is the correct design. It works fairly well but not completely accurate. Its full when it says full but when it hits empty I actually have about a quarter tank left.