The AEM GAuge is a piece of cake, seriously. Dont follow that how to because that is for a narrowband A/F gauge. The aem comes with its own dedicated sensor. I put it in the secondary spot of my ORP, since my 2nd o2 is deleted, and the guage has a harness that the o2 sensor plugs into. They wires are already heatshrinked, and everything. Only thing u need to hook up when installing this gauge, is a Hot, and a ground, IIRC. I have this gauge in my car, and its a snap.