Dude,
I don't know what you do for a living, but I think you should go into electrical engineering. You must have been the star student in you HS electronics class. This little gadget is about the most ingenious thing that I have ever seen. Fantastic little device that is probably worth 2 times what you charge.
Super easy installation in less than 2 hours.
I put a y splitter in mine to run one to XM and one to ipod. Just turn the power off to the one you don't want to listen to.
Thank you so much.....