what are the 3 sensors on the back of my obd0 ls motor? oil pressure sensor, and another 2. there is a oil pressure sensor on the obd2 and another sensor which is i think the crankshaft sensor. does anyone know the other two sensors and if i would need it. also do i have to cut up the obd2 harness for the plug at the crank? im trying to do this and a wire tuck at the same time, pics will be up once i get things done. any help would be good and im new to the board!!