We do not have any Davinci electric scooter owners manuals on our website or in our shop and with a Google search I could not locate any online. I recommend contacting Davinci Electric and asking if they have any owners manual available for their scooters. Here is a link to their contact us page: http://godavincigo.com/contact-davinci
If you do wind up tracking down a copy of a Davinci electric scooter owners manual it would be fantastic if you could attach a copy of it or paste a link to it here on this forum so other people who need it will have an easier time finding it.
Please let us know how it goes with testing for the speed limiter wire on the controller.