Android gauges

Lots of apps available - Torque is a popular one (you can even use TuneECU)
Biggest problem is that you will have a lag in the display

Did you bother to search ?

A number of us have installed the Koso tachometer on the Touring.

Others have done as you suggest, use their phone for a display -- though, as @DEcosse points out -- lag.

Perhaps @barbagris could chime in here with the benefit of his experience and latest thinking.

Sorry I'm not of much help.

I just don't see the bluetooth tach of being of much practical use with the lag :
Picture the scenario- you're accelerating hard & watching the tach to shift- you will clearly hit the limiter before your tach reaches that indication - so what's the point?

I dont have a rocket but can try to find some time on my bike to compare wired connection against bluetooth to see if it's any faster
(Anyone who has a TuneECU LonElec cable can try this)

I also love tachs, mine is blue and can change colors. The display has a voltmeter and keeps an eye on my charging system by displaying volts, and has a shift light and helps me not tap the limiter. Decosse helped me with this and mine has been flawless. I know it's not what you asked about -- just a little tach **** I thought you'd like; it's obvious you're addicted.

That Daytona Velona of @Kevin frazier is a really nice instrument

Just a quick update on testing:
The only app I could get to work with cable was TuneECU - this still showed a lag similar to Bluetooth, no difference really.

I tested Torq Lite and OBD Mary - these would only connect with the Bluetooth, no capability to work directly off cable
Performance similar to TuneECU, significant lag on the RPM

Per the Torque wiki the Torque Pro version will work with USB adapter but I wasn't inclined to purchase just to see a comparison (OK it's only $5 - but still! )



Even though the wiki specifically states Torque Pro (and there was no setting OBD Settings menu in the light version for USB), what was at odds with above procedure is that with app closed, and connecting the USB adapter it did not open the request pop-up window asking which app to use.
I could not use it with my phone as the USB adapter is different config from my Tablet

p.s. I should also add that my bike uses an older ECU by Sagem (as opposed to Keihin on the R3's) - this itself might contribute to some of the lag with cable on TuneECU, however I'm still reasonably confident that the Bluetooth even on the R3 would be laggy (similar to the video shown); however that is not to say that a wired USB option might not be better?