GETTING MY TOYOTA 4AGE ENGINE FOR SALE TO WORK

What other sensors need to I seem to incorporate over the standard 4age, inlet air temp in addition to a wideband sensor are actually prompt, is there anything I should really include? When there is not a patch harness, how tricky can it be to create my very own patch harness given I haven't any preceding wiring knowledge? Cheers PaulThese are typi