hey guys, I got an 01 lq9 and I need to figure out how to wire the bosch universal 02's I got, the bosch sensor has 4 wires, ,,,black-signal, grey-ground, whitex2-heater. my engine harness has 2,a purple and a tan. what wire go to what? I figure the whites get 12+ grey one gets ground somewhere, but what do the puple and tan harness wires go to?