I've got a Scangauge. Very handy little tool, besides letting you pull and reset any DTC codes it gives you things like water temp, open/closed loop, ignition advance, intake air temp, oh yeah, and RPMs. A very worthwhile investment. The scan rate is too slow to use it as a real Tach, but it will certainly give you RPMs at a given speed.
I'll check it out next time I get the bike out. It may be the end of the week as my house looks like a bomb hit it. Water leak, followed by a complete re-plumbing job and the associated drywall repairs. Not pretty, or cheap either.