I own a 2 floor house andI would like to install a 2 gang meter to feed 2/ 100 amps breaker box each one, I want to find out wich wire to use and if is necessary a by pass or it is coming into the box (2 gang),I appreciate for any information post here...

I think you would be better off hiring an electrician for this. More than likely something like this would need a permit and an inspection.