Relationship between manifold pressure and throttle position

Hello, when the throttle opening is small, the pressure in the intake manifold is low, indicating that the vacuum is large. When the throttle opening is large, the intake manifold pressure is large, and it is almost the same as the external atmospheric pressure if it is fully opened. Even when the vacuum is minimal. The vacuum degree is measured by the intake pressure sensor, and the signal is sent to the generator computer.