1970 Swinger 340 sending unit

My '69 Dart, just got it this spring, had a new tank and sender in it. I replaced all of the wiring in the car, new circuit boards too, and they have a solid state voltage limiter. Gauge would not indicate properly, gas tank leaked around sender. Cheap tank, the lock ring mechanism was all streched out of shape. Got a new stainless tank and sender, thinking maybe my old new sender was bad, nope. Called the circuit board guy and he said all of the aftermarket senders were junk, and until someone steps up to the plate, so he told me to get an original sender and send it to Instrument Specialties. The original senders look quite different. I got a sender from Mopar City for 45 dollars + shipping, and then sent it to Instrument Specialties and when Tom called me back he said 250 to rebuild it. My car is out of action till next year, so I can not tell you how well it works. Oh, and if you don't have a lock ring wrench, get one. Also, there are a lot of different lock ring thicknesses floating around out there, gaskets too. Be careful when reinstalling.