This display is really something you would see in a Chiropractic office to show Sympathetic & Parasympathetic Nervous System.
Not much to this video  other than some button cleanup with a burnishing tool and a salvaged mains button replacement. I end the video with some bayonet #44 colored LED bulb replacements which did give it some really nice color.

9338 – STANDARD WIDTH BURNISHING TOOL

Link to Brian’s Mobile 1 YouTube Channel where I learned about the great burnishing tool that came in so handy. Using simple sandpaper or a file would destroy the contact’s coating making the contacts corrode even faster. With the burnishing tool you just remove the haze or tarnish and then the contact coating can do its best for many more years.