Boost Pressure Gauge
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Ford Transit-350 HD, 2018 Ford Transit-350, 2018 Ford Transit-250, 2018 Ford Transit-150, and 2018 Ford F-550 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
The boost pressure gauge is controlled by the instrument panel cluster. The PCM sends a message through the controller area network (CAN) to the instrument panel cluster indicating engine boost pressure.