OK I have had my head down researching 'stuff', I joined an electronics forum to see if someone could supply me a diagram that would allow your controller to trigger my dashboard LED's.
A couple of options have been posted up, the latest seems to be the way to go but would ask you to have a look at it. I did ask the person if he was ok with me copying it to you and he is fine with that, unfortunately I do not seem to have the option to upload a picture or file?
So here is the link, there are a couple of questions posed by the poster such as 5v supply or 12v, and the green LED coming on at >20%.