with a maual boost guage you need to run the vacuum hose thru dash to the guage with an electric you only need to run it to the sensor (that is placed in the engine compartment most of the time!)that is provided and run the wires to the guage !
the installation on each is about the same give or take a few minutes!!at least i think so !
only better thing about the electrical is that you can have peak hold ..and warning lights and play back!