A better version is available here : https://cults3d.com/en/3d-model/gadget/ghostbusters-ultimate-belt-gizmo-with-daughter-bard
here is my take on the belt gizmo from the ghostbusters movies. it's not 100% accurate but it will get the job done.
You will only need two 1cm M3 screw, you can use real wire or filament for the wire. you should also be able to put led in the fake nixies.
final gizmo as a E not a Q on the right. it's just because its the one i will wear :)
it's heavily inspired by an existing kit i can no longer find on etsy.
you can also join our group on facebook to discuss 3D printed Ghostbusters props :
like usual everything is free and have fun!