Nps crew cab pollack valve

Gday, wondering if anyone who has fitted an extra fuel tank to a NPS crew cab could share where abouts theymounted it, photo would be great or brief explanation.
mine has an additional factory fuel tank mounted in same position on passenger side there is a switch in cab that changes tank flow and tank sender i can take pics tomorrow if you like
Thanks John, I have just folded a bracket and will mount the valve on the out side of the chassis right next to the fuel filter/primer pump. Not much room under there now with the rear air con lines and condenser.