kaoss
+1y
there are a couple of individuals on here that can build you a custom tank and use your stock sending unit and pump. May be search "fuel cell" I'm sure someone will chime in.
As far as the psi, really any inline fuel pump from Summit would work, unless you have a silly amount of horse power. Call up the local parts store and see if they can tell you the psi on the stock unit.
With my mazda I found that it was just easier to use the stock tank, relocted behind the frame rails, but I do know about your space situation.