Ford Rear Gas Tank Sender

[stone head]

I have a 1985 Ford F350 Motor home with a 460 engine The sender in the rear 19 gallon tank has 3 tubes how do I select the correct replacement for a plastic tank? ( the original tank "ingested " a lot of moisture and has rusted so far I( have located only senders with 2 tubes with varying resistances The pump works but the coil in the sender is long passed it Thanks