[Gregski]

so to connect the second oxygen sensor (O2 sensor) to the "dual" air fuel ratio gauge you first need to connect the small black box called a controller

but you can't just plug the Output plug of the controller into the input of the gauge because you see both plugs are FEMALE, you have to use their proprietary intermediate cable, which has two male ends on it, hey they gotta sell you some cords I guess, to me that's as logical as hitting yourself in the head with a hammer cause it feels good when you stop