Here is a few pictures to help see how I mounted the DM-100.
Top down picture
Note how that the brass metal strip has been bent to fit the back of the steering column.
Also note how much of the brass metal strip is used when it's glued to the back of the steering column, the more the better so it holds.
Front Bottom View
Note you can see the metal strip is a angled a bit, on a clock it would go from about 8:30pm ->2:30pm.
You can also see where I ran the wire back to the DM-100 unit.
Back of Gauge
Note how you can see one of the zip ties has been cut on the back of the gauge and the 'glue'..
The metal brass strip is sandwiched between the wire and the gauge.
The wire also is used to 'hang' the gauge on the brass metal strip.
Add A Fuse
Here is a close up of my fuse box and where I used an 'add a fuse' to get power for my gauge(s).
For ground I just used a screw inside the dash that was mounted into metal.