RPM Display for MASLOW CNC

This is a mounting kit for a RPM Display on my MASLOW CNC. It attaches to the Z motor mount by NED on the Bosch POF1200 Router. (https://www.thingiverse.com/thing:2756597)

The RPM display is based on a Arduino Nano and I followed these great instructions to build it.
https://www.instructables.com/id/Add-an-Arduino-based-Optical-Tachometer-to-a-CNC-R/?utm_source=newsletter&utm_medium=email

The lids may need some light sanding to fit depending on your printer, The display was hot glued usin