When do wages in all sectors of the economy rise or fall together?

If you mean nominal wages, this would happen during periods of high inflation or deflation. If you mean real wages (adjusted for inflation), this probably has never happened but theoretically could if the entire economy was growing or shrinking, or if wage earners' overall piece of the economic pie changed relative to other factors, such as unions driving up wages throughout the entire economy at the expense of corporate profits.

Real wages tend to rise with increases in productivity and a typical example was after WWII:
http://en.wikipedia.org/wiki/Economic_history_of_the_United_States#Postwar_prosperity:_1945.E2.80.931973
The reason is that that as productivity rises, manufacturers' costs go down so they can reduce prices while still making good profits.

Reducing prices increases demand so manufacturers have to pay more to attract labor. That means that even the other manufacturers will have to increase wages in order to keep people.

If only a small number of industries are seeing major productivity growth, the effect on general wages is correspondingly small, but there have been periods of major productivity growth across the economy.

Post WWII was on, in part because of the new technology developed for the war, in part because of the rapid growth in the number of people graduating from college, and in part because of the interstate highway system which reduced transportation costs significantly.