Has anyone installed an air fuel ratio gauge that shows the stoichemical mixture of the exhaust gases? I had one in my V6 Ford Ranger and it was invaluable in monitoring engine performance. It reads the voltage output of the left and right oxygen sensors and converts it to an electronic readout. Autometer product #7175. I need to know the location and colors of the wires that feed the central management computer to tap into the signal from the stock oxygen sensors. Also if anyone has good advice on mounting such a meter (2 1/16" dia.) that would be helpful. My unit is 2013 RTS.