A SIMPLE KEY FOR BLACKTOP 4AGE UNVEILED

What other sensors really should I glance so as to add over the common 4age, inlet air temp as well as a wideband sensor have been instructed, is there anything I need to insert? If there is not a patch harness, how complicated could it be for making my own patch harness provided I have no past wiring knowledge? Cheers PaulI am not sure if why my b