Fuel tank installed

So you bought a new sender/pick up unit?
They do not work well for the sending unit part, junk. If you have an OE unit, it can be reconditioned and fitted for 3/8 line. Elsewhere, meter match is a possibility.
I have 2 new sender/pick ups, thought that the new one in the tank when I bought the car was bad and bought another one, that's when I found for A bodies and that they were junk. Got an OE and had it reconditioned by Instrument Specialties. There are others that do the same thing