Majority of Jap gauges will be in BAR not PSI cause thats how they read it over there, as a personal choice i would go for the jap branded gauges regardless of the way they display the reading (bar not psi) because there generally very high quality gauges so its worth the extra money, for my personal car ive got some Apexi EL gauges i haven't installed them yet but they will be a lot better then the yumcha mechanical Timex ones i have now as for the electric or mechanical gauges for ease of setting up go electric because you can just get the source unit and then generally daisy chain all the gauges so theres less wiring to do, that and you have the wank features like the Peak and Warning lights