I am 100% sure there would be a serial connection on the sign device to connect a laptop to. 1. Call Macdonald bridge, pretend you want the exact same kind of sign for your "factory". Where did you guys get it? 2. Find out from manufacturer what software you need and what kind of cable to connect to it 3. Climb up there with laptop 4. Program "for a good time call... xxx-xxxx" I might do this