Model consists of parts: bar, blue regulator, body, bottom insert, green button, handle cap, handle, indikators, orange regulator, pins, red button, red regulator, screen body, screen, top insert, top regulator, wire.
Pins need to be from metal. Use real wire instead detail Wire in 3D model. During assembly, use guiding metal pins d=4 and 6 mm.
Useful links: https://ghostbusters.fandom.com/wiki/P.K.E._Meter/Animated