Digital Speedo conversion kit... Anyone tried this?

https://www.dimecitycycles.com/acewell-digital-speedometer-conversion-cable-for-honda-yamaha-moto-guzzi-ducati-ccm-susuki.htmlWas looking for an easier way to hook up a new digital speedo for my project, 1980 cb750f dohc, and I found this. Does it work properly so I don't have to drill a hole on my rotor to mount the magnets?​Edit: are those made specifically for Acewell gauges? via /r/CafeRacers https://www.reddit.com/r/CafeRacers/comments/9ne8dx/digital_speedo_conversion_kit_anyone_tried_this/?utm_source=ifttt