Just one thing that came into my mind regarding the whole steampunk/dieselpunk/cyberpunk thing:
Some timeframes concerning the historical backgrounds of the corresponding punk settings:
Approximately 1870s – 1920s:
The Steampunk Aera
After all, it was the high time of Victorian and Edwardian Times, it was the lifetime of Verne and Wells and this is where we Steampunks draw our ideas and aesthetics from.
Approximately 1910s – 1950s:
The Dieselpunk Aera
(also: The Pulp Aera), yes there is an overlap.
The start of the pulp fiction area, the Golden Age of Science Fiction and also the time of both World Wars. Diesel and petrol replaced steam and technology moved on (what a blunt, unsophisticated summary).
Approximately late 1970s – ongoing:
The Cyberpunk Aera
with many things described in Neuromancer already existing in reality (the internet) or emerging.
I am not going into detail, we live in this area now, so why should I bother describe it? Just look around you!
Also: The original Punk movement also started in the 1970s.
So, we have a Punk-Gap of some 20 years, where there is no specific technology-related subculture.
My personal unverified ad-hoc theorie is the following:
The gap-space is the time of the space race. There was no need for a specific technology relatedsubculture in this time, because weird, arcane, cutting-edge technology was all the rage and everybody was really interested in the New Frontier of Outer Space.
Interestingly, cyber-culture has not penetrated all levels of society yet, as the space race focused the interest of every strata in society of the participating nations and power blocks. Well, within a generation at the latest, cyberculture will be everyday culture and Cyberpunk will be Mainstream Punk, what a weird thought in deed.