Please see the attached images. Something else dawned on me as a possibility. I'll do my best to describe it. In the first image you see the top plate of an OEM 1952 pickup sending unit. It might look like you can mount this 5 point star in different ways but you can't...or that is to say it should be made so the bottom two points of the star (across from the one closest to the sending wire connection) are slightly further apart. This forces the float rod to swing parallel to the tank sides, however (a large however) if you install the float backwards...that is pointing toward the outside wall of the tank and not toward the center of the tank...the float can rub on the side of the tank and keep it from working. The second float orientation image in the attached images are not what you want your float to look like. You want it to look like the first image...pointing to the interior of the tank.
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end