Project: Integrated Electric Gate remote

Hey everyone, I get my new car tomorrow and we are having a sliding electric gate fitted to the front entrance to our property. I am after some advice on an electrical project to permanently fit a switch into my car.



I want to avoid rendering one of the remote fobs they give me useless, here's a video example of what I'm after, but I really don't understand how to know where to solder :(



http://ift.tt/1xVax2b



Cheers