I think I know the one you mean, will see if I can find it as well. In the meantime, another missing link (pardon the pun) is the Link Trainer.
This one is complete and functioning in the 94th Bomb Group museum at the old 8th Air Force airfield at Rougham in Suffolk in the UK.
Unfortunately the room was not big enough to get whole set up in the shot but you can see the instruments in the box under the boots, and it is connected to the original plotting table that tracked the “flight” across a map of the local area.
