i have tried a couple from van's auto and they have worked pretty good.
just install them without the gasket, then manipulate them with a rod of some sort while your buddy watches the dash gauge to confirm the gauge is close to what you raise and lower the float arm to.
my charger has one, and a buddy's dart has one.
as both of these tanks have a side fill neck, it was easy to move the float arm and see what was going on.
make sure you check the retainer ring thickness. if it's thinner than your original, use your original retainer ring.