yeh just leave your standard loom in place i personally moved mine about abit so you couldn`t see it

pf 09 tps is for a 4x4 saph and a pf01 is 2wd

as for the hole its the best route to take with the original cos bung on it looks factory fit

the 4 wires are 12 from bat, ignition live,fuel pump,and a signal for the rev counter