Working on a project to braille the temperature gauge on my new electric 
smoker.  I have figured out that it can be done, disassembled the gauge and 
the needle is heavy enough for touch, etc.

However, I now need to put the braille around the outer rim of the dial 
disk.  I plan to mark it similar to braille watch markings, using three 
diots, two dots, and one dot for successively smaller intervals.
The disk has an outer rim, so it is more like a shallow streight sided dish.
Any ideas would be helpful.