I dont have the time to draw out a diagram right now but about your DSSC vs. CarPC question, I have the latter. Im impressed with the functionality of it and how much it does. I only have one real complaint though, can we get in a more, ummm , "finished" form? By that I mean mounted in side a case that allows accessibility to the config button and a way for you to see the lights also. When troubleshooting or test running your setup I have personally found that thing to be a pain in the @ss to try to keep safe. But this would apply to any of the SDC controllers. I cant tell you anything positive or negative about the DSSC as I have never personally used them. I can say though that I would buy my CarPC Pro again and recommend it based on personal experiences with thte product and company. Hope this helps.