TOP GUIDELINES OF JDM TOYOTA 4A-GE

What other sensors ought to I look so as to add in excess of the normal 4age, inlet air temp along with a wideband sensor are already proposed, is there the rest I ought to include? When there is not a patch harness, how tricky could it be to make my very own patch harness provided I haven't any preceding wiring knowledge? Cheers PaulThe still left