hookeduphatch95

i have a 92 civic CX w/ a b16a swap. i tried to hook up the autometer cobalt a/f gauge and it doesnt seem to be getting the correct signal. does anyone know the cpu pin location on a P28 computer for the 02 signal wire? or if anyone has any ideas plaese feel free to leave me some input. i replaced the o2 sensor and when i crawled under the car it had been hard wired instead of using the plug. would it matter if the two black wires were mixed up?(two black wires, one white, and one green wire on the o2 sensor)