The trailer for a "Superbeetle", B movie that I saw as a child. An English language dub played matinee shows in America in the 1970's. I remember must of the gadget features of the car, but I have no memories of a lot of other stuff in the trailer. The movie seems to have been a 1970's contemporary version of films like "Those Daring Young Men in their Jaunty Jalopies" and and similar films. I guess that that makes it of peripheral interest to steampunk fans.
The movie is pretty terrible from an adult's perspective, but if you are fatigued of CGI effects, you may be pleased to see that this film was done almost entirely with practical effects.
Superbeetle, the Herbie movies, Speed Racer, Chitty Chitty Bang Bang, the Wonder Bug Saturday morning show, and the Roland Emmett kinetic sculpture that I saw in a museum in Chicago all combined to fill my childhood daydreams and drawing with gadget equipped cars. This might be a factor in why I find steampunk appealing.
In the 80's Transformers type robots seem to have taken the place of gadget cars in the imaginations of children; nothing like Superbug or Chitty Chitty Bang Bang seems to have been produced since.