Here are a couple of diagrams for installing test switches for dual and triple guns. The diagrams are located on a few other sites, but I figured they would be easier to find on this site. The diagrams are for traditional firing boards, but the same principles can be applied with newer styles. Test switches allow individual tweaking of dual and triple guns, which is necessary for optimal performance. The yellow things are connectors, and flyback diodes are shown if the board does not have them installed. The green dashed outline shows the connections inside the BC test switch boards, which have separate instructions included that show the same arrangement. The BC board also have the option for splitting up the positive leads if desired. Here is a configuration for dual guns And one for triple guns
