Here's a few detail shots and how-to on my Side Mount Speedo. This idea actually came from Seth over at BoltsAction. I saw his speedo and loved the way he had it nice and low and out of the way and he emailed me some pics of his almost a year ago. I've had mine mounted here for a while and I can say, it has never come loose and still works fine! While some will say speedos are for suckers, its nice being able to clock your mileage on a road trip and know when its time to slow down near the fuzzzzzzz......
After removing your speedo from your riser mount, disconnect the wiring harness. Then with your angle grinder of choice (I rock Dewalt electrics for all my power tools in the garage) go ahead and cut that left mounting tab off and smooth it out with your flapper disc.
The only thing you actually have to fab would be this small little bracket which was just 1/8" thick x 1" wide flat bar stock. Measure it to the length you want and buy a set of nut, bolt and lock washer.
Loosen your engine mount bolt and put your new bracket in place, making sure your drilled hole will fit the engine's bolt. Position it in place so you can see it while riding, but its still tucked away nice. Last thing is to plug your wiring harness back in and then find a nice new spot to stash and hide it. Or of course, cut the harness out and hardwire everything together so you don't have all those big chunky connectors everywhere.
In the picture above, I unclipped my spark plug wire from the small little hole just to be able to show the new metal mount a bit better.....just fyi.