I have searched and sort of found my answer, but I need to verify this first. I am installing an A/F ratio guage in my 04 R/T. From what I gather I need to tap the wire into the sensor that is at the beginning of the cat. correct? and does anyone know exactly which wire it is? Thanks a bunch guys! By the way its an Ebay Glow.Shift tinted guage, I have it installed in the pillar, it looks pretty cool both on and off, but now I need it to do the blinky blink thing!