Hello James,
Just a couple of points:- In my experience, the only place to go for information about recommended tyre pressures ( if not shown inside the fuel filler flap etc.) is the vehicle handbook, checking against wheel and tyre size, and number of passengers etc.
Over inflation and tyre pressure warning? Good question. Does this system alert to over inflation as well as under? If not, it should do.
Kind regards,
Gareth.