Each guage will come with its own instructions on how to install it. Most common are air/fuel, volts and oil pressure, as the duratec is known for commiting suicide on hard right hand turns. But volts is a simple two, maybe three wire hookup, air/fuel is a lil more involved, but i dont think its just more then locating and wiring. But oil pressure i do believe you will need the sending unit, which would have to be mounted in then engine somehow.
Boost would not pretain to you unless you go with a turbo or supercharger.
i went digital, volt and tach, never got around to a third gauge. i got the second tach because its more acurate, but also it just moved around alot, so it was flashy.
