What?

You don't need an efi tank, the pump is external and you don't need an efi loom. With after market management such as megasquirt. You need an efi inlet manifold from a fiesta rst or xr3i (cvh) with fuel rail and wiring, a CPS sensor and essentially your away..... WB lambda is good, as is an ISCV etc but they are not essential.

If your getting cold feet now mate i would probably leave it as it is.....