I have the Northern 60 gal combo and love it, one thing I did before I installed it was to weld a 1/2" npt tap on the bottom corner left side so I could feed my pump from there down on the frame rail, I purchased a fuel level sending unit from Westech and ran a gauge into the cab, now my oem tank is for transfer. The setup is working great and the lift pump is now a supply pump cuz it aint liftin crap but has instead a positive supply feeding it... ... ... see my sig for all the details.
Cheers, Kevin