The orange wire goes to pin 1. For my DCC conversions I prefer to use Kapton (Polyimide) tape. It's heat resistand and the adhesive doesn't go all gooey as the adhesive on other tapes can over time. Decoders can get very warm and need ventilation or they could overheat. Thick tape on top of the decoder may not be a good idea. We don't need so many lights, (ditch lights etc.) Wobbly, because all our tracks are fenced in to keep the great unwashed from straying onto the track. 😆