Here is the pin assignment for the Z30. Fundamentally it is the same circuit in the Mega Enigma, just smaller.

To understand how this will be illuminated and read, see the following log on the Mega Enigma project page:

https://hackaday.io/project/165559-at-mega-enigma-a-2560-pro-mini-enigma-simulator/log/163886-led-and-keyboard-pin-assignment-completed