I just got one from 521 restorations he was selling them in the b-body parts section with a good price. Tested it before I installed it and it read fine thru full travel and seemed to read what I put back in the tank after draining it to swap senders. These are the 3/8 outlet with a return on them but the return can be plugged. You can also mini clamp a ground wire on the return and run it to the bolt in the body that holds up the fuel line above the right front corner of the tank,for those missing the hogey ground strap.Juat my 2cents but these did work and other "new' ones did not...Bruce