I have had the Datatool DiGi for over 2 years. There was no 919-specific plug-and-play DiGi unit available at that time...it sounds like there is still no such unit.
I used the universal unit. The Datatool instructions are good, but I found a website that included a step-by-step photo installation tutorial that was excellent. All the connecting wires are soldered to wiring located inside the headlight shell on the 919. It is easy to access the appropriate wires.
Like 9nineteen said, installation is "tedious but EZ".
mdtoney, it does not take 5 hours to install. It took me an hour to make the soldered connections and about another hour to cram everything back inside the headlight shell and get the damn thing tightly closed again.
Programming the installed unit involves running the bike through the gears and touching a bare wire-end from the unit's wire bundle to the bike frame...so a center stand helps a lot. The programming is no big deal, as you can do it over and over again until you get it right.
I have had no problems with it since installation.
The photo below shows my mounting point: right above the idiot light cluster (Radio Shack super hold plastic velcro), nested down inside a Buell M2 fly screen. Here the fly screen looks lopsided because I took the photo leaning over the left side of the bike. In reality everything is symmetrical. Gears are indicated on this unit by large red numbers. In neutral or with the clutch pulled in, the individual led number segments spin around the display like a pinwheel.