This short video shows how to check your car's gas tank sending unit to see if it is working properly. The sending unit must be removed from the tank to test it. An ohmmeter is all that is required.
Thanks for your interest. I should have it painted in 2-3 weeks I hope, and then I want to assemble some of it before putting it back on the chassis. Maybe by end of June or early July the body will be back on.