ok got a d16y8 motor an baught a p28 ecu an obdo obd1 and im gettin the conversion harness didn't do a mfi swap cuz i was told it wasn't worth the time anywayz im reading about some 4wire o2 sensor crap anywayz how hard is this an i know i should wait till i get the harness but could yall break it down for me in a easier understanding