For sale. Used AEM A/F gauge, wiring and Bosch o2 sensor. PN 30-4110. I got a Holley Sniper and it shows A/F on the monitor so I no longer need the AEM gauge. Worked perfectly when it was in. I'll throw in the o2 clamp fitting from my Sniper kit or you will need an o2 bung to weld in (not included). $50 shipped usps priority. I should have the instruction sheet, let me look for it. IM me if you are interested. In AZ. Paypal preferred.