Ah, Neither do I!
I don't think its necessary in the slightest, but I need another project to do while my Stage 3 is in limbo mode and what with having my autotune, it'll be nice to see what its reading when im riding and as for the RPM thats just an added feature.
It's just something to do really
Oh, and I would look at it, alot!
I like rev counters, they're a novel idea and miss having one on my bike.