ok my friend just gave me a autometer phantom air/fuel gauge and i have a question. he did not give me a sensor for it but can i use a stock o2 sensor as the sensor? my car is a 2003 mach 1 and my rear o2 sensors were shut off with a tune since i have no cats. so can i unplug the harness to 1 of them and use the o2 sensor for the air/fuel gauge?