Similar to one one of them above, I made my own tank bracket (that held an old off-brand GPS before I knew about RAM mounts) then bought the handle bar clamp RAM mount bracket because it gave all of the pieces for the best price and I could attach it to my mount. You could swap it back and forth by removing the screws if necessary. I also plug into an outlet I added inside the left pocket as others have done.
How does this setup do for vibration? Is the tank well-insulated from vib/shaking? My eyes ain't what they used to be (need reading glasses, but don't wear them driving/riding) and vibration makes those things hard for me to read.