OK - I'm going to resurrect this thread since there are a few thousand new Smart owners since it was last posted.
Last night I worked up the nerve and tried

Cube's mounting.
First off- my Scangauge is OLD! One of the first units of the Scangauge II made and it's been in an assortment of vehicles and mounted in a variety of ways so I had quite a bit of cleaning crude/tape and whatnot off as it had been stuck on all those different cars over all those years. While cleaning it with my bone crushing
Hulk 
like hands I broke it!
Next - my Dremel

I used was a cutting wheel type, turned out with a less than desirable cut but it wasn't too too oversized. Sooo, I took some tub and tile caulk almond color and filled in the ever so slight gap. It doesn't show up as much as it does in the picture. If it wasn't for the break it would look super good. I will take my time a bit more on my next Smart but I figured I'd resurrect the thread for newbees out there.