Converting to dual tanks ?'s
 

I've got a '74 K/20 that I'm putting dual gas tanks on. I have most of the parts but I'm not sure where all the lines go, which sending units to use or how to hook these up. Does anyone have a diagram or pictures of a factory dual tank setup? I don't have any emissions equipment on this truck so I'm not sure if that makes a difference with the sending units and how many outlets they have. Thanks