Great find, Gun games are awesome and it is nice to have at least one in your collection.
I hate moving them though , they are so temperamental and they always get out of adjustment mine always need some tweaking after any moment at all.
that is very cool that you are taking the machine to the TPF for others to play. many people have never even seen or played an EM gun game.
Steve young has schematics for most gun games.
Brian