BMW R nineT Pure
I added the OEM tachometer, aka rev counter to my 2020 R9T Pure in June. Everything works fine on mine. It displays both average fuel economy (mpg) and instant/current fuel economy. The tachometer unit doesn't show current speed, but does show average speed since the last reset. I've not reset it, but I can see doing so at the start of a trip or maybe a long dayride, mostly out of curiosity.