I hooked my system up this weekend, and it is sweet! I had to take the front seat (passenger) out to do the wireing under the carpet. I bought a gold-plated battery terminal from Walmart for under $9! It has one 8 gauge hole, and two 4 gauge holes. This is what I hooked my TFT screens' constants (yellow wires) to. The Z919 had no conventional way for extra inputs, so I had to spring for a Audiovox FM Modulator. It has to be put in series with the antena so that when you switch it on, it disables the radio antena.