Electric fuel pump question

What are you using for fuel lines from the stock tank to the pump and also for a return line back to the stock tank? I would think you would want the same size return line as your feed line. It would be great if there was a sending unit that had AN fittings.

well im using 1/2'' feed and return and a bypass regulator and the 392 pump. just solder a an fitting for return in the indent in the top front of the tank easy to do to any new or used tank but some people dont agree with how i do it to used tanks.well most think you cant weld used tanks.