Although the countrtop installers will install the sink, they won't do the hookup.
We always replace old shut down valves and the new faucet is hooked up to these.
The dishwasher is connected to the appropriate supply valves and drain lines.
Disposal is hooked up including electrical the connection.
Soap supply hookup.
Any special soap dispensers and sprayers are hooked up.
Fridge line connections.
Should the project require a new fridge line connection, it is hooked up at this time.