Being a cheapskate, I bough the cheaper one. I have no problem connecting it up, just wanted to see where others have their sensors, not the wiring. Maybe someone has a better idea and did a better job than me that I could copy or learn from.
There are a couple of positions but they are prone to dirt, grease and gunge.
My previous bike had a gear indicator but I never looked to see where the sensors were attached. I may try and track it down and check for myself.