I think you'll be going digital for sure...msd makes a small 1-12 cylinder programmeable shift light that mounts right on the bars, I know you want a gauge. But all else fails, at least you can set it where you want and it'll light ya up when its time to shift.
I found a mount at pingelonline.com as well as the msd shift light. I've contemplated getting this, but am checking other options as well.
I jus hate trail tech I have a vapor I don't wanna be looked at some little numbers at 70 through trails jumps and dirt they hard enough to see jus sittin still unless ur at jus the right angle or sunlight. The shift light idea isn't a bad idea tho I'm for sure gonna look into a few more options I notticed on sone of the turbo kit makers they have a tach on theirs. Wonder if it for show or fuction.