I have a 1j non vvti in my 89 mk3, my 1j came with the 3 wire o2 sensor, 1 blue wire and 2 black wire. I need to know what each of those wires are. I have a tweakd wiring harness and they used the 4 wire plug with O2 heater, and 1 is just o2(im guessing thats the signal???) And + and -. How cam i wire them together???