No just one! The reason is, the body harness for a RE has the O2 sensor plug, and the RTE has the O2 sensor plug in the EFI harness! Thats why you have two O2 plugs!
Did you check the pin locations on the ecm and ecm plug's? Some years are different! I got a spare harness that was supposed to been from a 86, but it is actually from a rig that is 1988 or newer! Some of the color codes and plugs don't match up with what the wire schematics say they are supposed to be for a 87'.
Try reading any codes? If something is not reading it should tell you!
