Replacing fuel tank in 72

[OutlAw_8]

Hello, my 72 has set in a barn for many years so it's got bad fuel in the tank. I recieved a replacement tank that is originally from a 71. It to is the behind the seat tank. My question is that my 72 tank has 2 lines on the sending unit and the replacement only has 1. Do I need to swap sending units or can I use just the 1 line on the replacement? It is probably a dumb question but it's my first rebuild project. Thanks guys appreciate the tips and advice.