1932 gas tank sending unit, passenger car

[Brian King]

Deuce lovers -
What's the trick to putting a sending unit in one of these original tanks and using a "modern" (50s Stewart Warner) gas gauge. The opening on the tank is too small to fit the unit I bought from CW Moss. I was prepared to solder in a p/u tube into the new flange of the sending unit, but even the float won't fit in the opening.
There's gotta be some way to insert a sending unit and a pick up in that original hole.
Car is 6v, but not sure that matters.
Thanks.