/diy/ - Do It Yourself

I'm trying to build my own controller that's a light gun with a small steering wheel attached on the side of the gun. I think I know where to find the parts for the wheel so I'm not worried about that but does anyone know where I can get a functional lightgun that works on a standard computer screen?

I'm not worried about the technical aspects. I'm pretty quick when it comes to learning new things and am sure I can figure it out if I work hard enough. Just a few pointers on where to get the proper parts would be nice. Attached is concept art for a video game console I am looking to make. Building the whole console is too advanced so I'm settling for just the controller right now. Thanks.