Yeah, same!
I am just after a tacho really. I want to mount up a 3 inch one front and centre, next to the original water temp gauge on my race bike project.
I've seen some universal ones at the auto parts store... I guess they should work? 4 cylinder 4 stroke engine is a pretty common engine format. Haven't looked at where they get their signal from or anything...
But is there any specific BMW / motorcycle / k series thing that'll stop it working properly?....