Hi 940volvoman, yes its pre-wired from the 1995 model year IIRC. You need the display with the WHITE connector to fit the 940. There is an identical display with a black connector that fits the 960 - AFAIK they are not interchangeable unless you rewire the sockets (and I don't have a wiring diagram for that).
The sensor should fit into a socket in the lower plastic grill -
The wiring connector is tucked away either behind the bumper or in the corner where the battery tray is.