you can run safely more pressure more reliable like i said there are upgrade 170-180bar vag fprv they need some work to fit on the speeds
and i got a custom hpfp in my car (totally useless in my case :D) which flow more and should also can deal with the pressure but i don't have the...
the pump from mazda is a vw pump ea113 2liter golf gti and the roller setup you can just regurlarly buy from dozens of vendors i try to get some answers from Jens but i can't promise it he quite rarely shares deeper infos i can only tell what he did show me and what i've seen ..... but i try...
the ecu can measure it if you change the scaling via winols + fp valve upgrade from a vag and bosch fuel sensor but changed it later for a custom rail because of making it more comfortable to work on the only damage was the cup broke once but that's also easy to upgrade for a roller setup
fuel tech ? i mean a lot lot lot of guys running fuel tech pumps on vag (ea113 uses the exact same pump) and i installed couple of them not a single issue + 150~ euro cheaper than autotech