I am still sorting out my "89 DX. I "assumed" that since it was a carb it had no computer, but yesterday I noticed it has an O2 Sensor in the downpipe below the exhaust manifold. That sent me to PDF manual I have and the O2 sensor is shown but I can not find to what it connects. I thought maybe the Magical Black Box with its numerous vacuum tubes, valves and wires, but did not see it. So to what is the sensor connected?
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