Thanks in advance, I just bought a car that had a 60 mm Greddy a/f gauge installed, the white box is wired and ready to accept the o2 gauge, however the gauge didn't come with it. My brother in law has some 4 wire o2's laying around and if I can find the diagram for the greddy (color codes) I can just wire it to one of his o2's and save some cash. Any help is appreciated.