Let's start where I left off. The momentary switch on the flashlight is to big for my suggested application.
Fast forward to today. My 2020 650A has a working Rostra. Nothing big or exciting to announce but the use of the Rostra 250-4165 VSS kit is the key to my success. I mounted 4 magnets and pickup coil on the left side rear, 4 magnets 90* apart on chain sprocket with pickup coil mounted low on inside of swing arm. The reason I chose the left rear was to avoid signal interference from anything in the path of the pickup coil's wires passing from front to rear, plus I wanted no interference of ABS signal on right side. I used a single relay for LED brake disengagement but I'm still working on clutch relay disengagement. For my controls I used a CCS-100 pad which I already had and was waterproof prepped . Dip switches set @ off, off, on, off, off, off, on, off, off, off, off, off. As for as servo placement I chose the tool compartment under the seat.
But choosing the tool box under seat meant lengthening the servo cable, which I did. First thing I did with the snorkel and servo cable completely off the head unit was dimension the cable length fully extended to be used for fabrication of the new servo cable. Writing that dimension down I then cut the old servo cable and housing flush with the end of said snorkel then drilled the old cable housing out of snorkel for a tight fit of new cable housing or housing with ferrule end. I used a bicycle brake cable repair kit like I have done numerous times for motorized bicycles.
https://tinyurl.com/yj29u4a8 I cut one ball off the old Rostra cable, drilled it out for new cable diameter, drilled a concave pocket for frayed cable end, install cable, fray end (e.g. birdcaging) the cable then flux and solder the ball to the new cable. If soldering with a small butane torch is your thing, it is mine, you can't go wrong with this,
Bicycle cables video
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Here's video that also encompassed the basics for motorcycle cables,
There are many videos for DIY cables out there.