You tap into the channel that carries the pressure pulse normally, but is blocked by the carb rotator block. There is just enough room to install a brass nipple on the cylinder. In the picture it's top center toward the back, it loops up and over to a nipple I installed on the carb plate that is held on with the big screw. The thin steel plate is tapped for a brass nipple, the that line is ran to inside of the fuse for static air pressure.