I like the Koso clocks as used by some WSS teams, I think it’s the RC250R setup but of course uses a racing loom.
I like the look of the new TFT(?) display on the Duke but don’t think it’s possible to retro fit. I find the RC gauge annoying as for an older person it’s hard to make out the rev bar and why the backlight can’t stay on all the time!
I did speak to the chaps at Scitsu and you can fit one of their rev counters but of course you need to fit it alongside the existing dash.
I ask because I know that most times manufacturers like to make as few parts as possible. Therefore I suspect that the wiring harness is the same on the Duke390 and RC390. I could be wrong, but why? Its got the same sensors. Why make two wiring harness connectors on the top end of it?
If someone had a 17 or 18 Duke 390 near me, I'd love to try it. I have a garage to work in, lots of tools and decades of professional auto tech experience.
It might not mount up. You'll need the left controls also. Since the RC is more race oriented, they probably figured there's no need for all the extras. I doubt the harnesses match, but you never know. May need an adapter harness.