Tachometer housing

Few years ago well-known modelar Zbig has developed excellent tool for RC hobby - tachometer.
It is an instrument measuring the rotation speed of a shaft or disk, as in a motor or other machine https://en.wikipedia.org/wiki/Tachometer

All details about the project you can find on: http://elfly.pl/tachometr/tacho_eng.htm or Polish version: http://elfly.pl/tachometr/tacho.htm
Author: www@elfly.pl

I decided to make a housing for it, because I'm testing now new software DesignSpark Mechanic