the pipe marked as no 2 is std on 4x4's, the hole at 1 is where the std breather goes and it return the oil to the sump via no 2.



so you remove the std breather completely, the fit one pipe to one port of your new bretaher on this side of the engine, the other port comes from the blank plug un the other side of the block the knock sensor has a small bolt folding the wire inplace as std) then your oil return goes to 2 back to the sump, the large vent on your brather then either vents to atmosphere or to a catch pot....

like so...