Something interesting I found out about Gaucho, I watched a movie last week on Turner Classic Movies called Games from 1967 starring Simone Signoret and James Caan and noticed a pinball machine in the movie they called Turnpike. It was on my list of things to research and it was actually Gaucho.
From the wonderful Pinball in the Movies by pingeek:
cocktail party scene in game room, 7 minutes, 33 seconds into movie. The machine has been rethemed into "Turnpike Pinball." The playfield layout is the same, but painted. The back box is completely different, non-wedge head.
Directed by Curtis Harrington. With Simone Signoret, James Caan, Katharine Ross, Don Stroud. A young couple who are into kinky "mind games" get more than they bargained for when a mysterious woman comes into their lives.