I purchased a BD X-Monitor (Pyro & boost) from Geno's garage. It mounts nicely underneath the grab handle. Retaining the grab handle was the main reason for choosing that guage.
It seems to work well, as far as I can tell. The only downside that i've noticed is that if the sun is shining at just the perfect angle, it will overpower the readout on the guage. It's so seldom that this happens that I don't consider it to be a serious problem, at all. Would not cause me to want another guage system.
I, also, made a "hood" out of a plastic switch box (purchased from Radio Shack) to help with the reflection from the sun. don't know if it really works, or not. I did this upon initial installation.
Having the grab handle is well worth any negative the X-Monitor may have, in my opinion. I'm, also, happy with the performance of the X-Monitor. It has some pretty neat "memory" features, also. Great for monitoring changes when adding performance add-ons.
Joe F. (Buffalo)