When it comes to OBDI conversions on 1988-1991 Civics, I have been doing them for quite some time. But NOWHERE in the multitude of wiring charts can you find anything relating to the oxygen sensor or EGR. Does anyone know where to connect each of the wires on the oxygen sensor and EGR? For instance, the oxygen sensor has gray, yellow, black, white, and orange wires. I will assume two are for the heater, one is a sensor ground, and two go to the ECU. But which is which? Is there a resoure out there with this information?