Doubt you will find anything in aftermarket senders that has the proper shaped tubing and float to reach the tank bottom like the original sender but wonder if KM Lifestyleshttps://mykmlifestyle.com/Packard_Fuel_Sender.html could custom make you something with the return added.
If your gauge just needs the correct power to work might try a Runtz Voltage drop unithttp://www.fifthaveinternetgarage.com/electrical_parts.php but if it is actually shot then you could also have the proper resistance for a modern gauge such as one of the retrofit or vintage types sold by Autometerhttps://www.autometer.com/gauges/antique-beige.html or Classic Instruments.https://shop.classicinstruments.com/universal-fit-gauge-sets built into the sender. I believe Classic will also custom make a gauge with a face that will match the old originals. Several have recently had KM build an original type repro sender and from reports posted so far, the price is not outrageous and they seem to work well.