I recently purchased a Model IV in really nice shape. However, it does not have fuel site tubes or any placard. Previous owner told me you can just look through the fiberglass and see the level - but sorry, maybe my old eyes are getting tired but it seems pretty iffy to me. Anyhow, has anyone added these tubes to an existing aircraft? Is it as simple as buying the kit and some grommets, drill appropriate holes in the tank, and hook it up? If anyone has done this and can share the experience I would appreciate it.