At last, great work Cristiano!
I've been testing with Simscreen and DLC-247 and RPM% really is important, so as to keep SimDash setup compatible with as many cars possible. As PCars sends maxrpm it is possible to calculate RPM% internally, please try to implement.
Also the requested feature for data display changing by controller button (from wheel, button box or keyboard) would be a very appreciated enhancement to an already fine product! I know this is in your plans, it's just that simracers are impatient by nature, mea culpa
One more thing: I'd like to disable hardware support, in SimDash frontend, so as to drive only SimScreen for instance. I think that this was possible on early version(s).
Thanks