Vive Controllers Button Mapping

I'm trying to devise a way to cycle through the visibility of models in the scene by utilizing the left and right buttons of the trackpad. I'm new to Unity, and hoping someone might be able to provide some information on how I might accomplish this. I already have SteamVR loaded and working, but I'm not sure on how to link the specific left+right trackpad buttons to a script.

 

Complete noob here as well....but perhaps this might help ....