Can anybody give me a definate confirmed legal standpoint for the mounting of a pillar pod and two gauges on my 2001 bug eye?

Recently there was a big stink about people getting busted with a tree deodourant hanging from their rear view mirror, so how does the pillar pod rate? Would be installed professionally.

How about a 5" rev counter mounted at the bottom of the pillar pod? That may prove to have a little vision hampering capability.