GPS Mounting on Triumph Sprint ST
When I purchased my Garmin Zumo 550, it came with a bunch of Ram mounting hardware that gave me lots of options, none that I really liked. They either looked ugly (bad), blocked part or all of the dash including controls or the ignition switch (worse), or limited the ability to turn the handlebars (a non-starter). So, I looked for another way.
I found an idea that is essentially the same as I describe below and I am indebted to the person who posted that information. So, the information below is from me but born out of an idea of some other unknown person who was kind enough to pass on his idea. I'm doing that here in the same spirit. Pass it on.
The photo above shows the Garmin (usually in better focus) in place and how it appears from approximately my driving position. The final position is very adjustable because of the Ram mount ball joints. This is how I like it.

The images above show the mount from the right side of the bike with the handlebars fully right. There is plenty of space between the mount and the dash (more than it looks like here). The image on the right is just a closer look of the mount. The power cable for the GPS is zip tied to the base of the Ram ball.
The shot above is from the top looking down, again the bars all the way right. Lots of room for the GPS unit to move without hitting the wind screen.

Above are from the left side showing some of the little aluminum bar, nuts holding it on and the Ram ball mount bolted to it. The two cap bolts that are used to hold the left handle bar on are used to hold the aluminum bar on. The only thing needed to do this are the little aluminum bar, two longer cap screws and two nuts that fit the bottom of the screws. More on that on the next page....