i have purchased a few of BLMS modern block signals and i have been needing some help on hooking them up to a tortise switch machine. i am wanting to run them in series withthe switch machine so that when the switch is thrown it willchange from green to red and vice versa. when asked on how to do this i was told to use resistors that where specified and to follow the diagram for them. well the signals dont come with instructions or a diagram to follow and also where to i get the risitors needed for these signals.