To answer all the questions about what wire to tap on the dimmer switch on 2004 Ram 2500's it's the bottom right orange wire with the skinny brown line. Also confused with the same type wire the comes into the top of the connector. Through process of elimination and no volt meter on hand I found this out yesterday. It also makes a whole lot more sense because the top wire brings the power in and the bottom wire takes the power out to the guages. Successfully placed new boost guages and pyro yesterday:-laf. Saved myself a whole lot of $$$ and feeling pretty good about it.