sorry for the semi-novel but here it goes,

SO i sold my exhuast, which was a hytech header, high flow cat, and t t1r exhaust, and the kid who i sold it to gave me his test pipe and dc 4-1 header, though his header is off of a 94 so its not extended for 2 o2 sensors, So the first o2 sensor plugged in fine into the the test pipe, but there is no bung for the secondary o2 sensor which sits right at the end of the test pipe. i just ordered the obd2b-obd1 wiring harness and a chipped p28 ecu, so with an obd1 set up does it not require two o2 sensors? or am i going to have to cut and weld a bung for a secondary o2 sensor?

 

OBD1 vehicles do not use a second O2 sensor.