I believe the tech affects all kinds of income.
Personally, I tend to focus on population-limited economy techs (construction, research, civilian economy); things that will eventually be mostly unmanned will have lower priority unless they are currently a limit. I don't care much for fuel because I take care of that on the demand side.
Because I strive to be limited by population and because they are very inflexible (can't be transported), financial centers are under consideration only when my economy is overstretched.