What is the working principle of the intake pressure sensor?

[BeckettAnn]

The working principle of the intake pressure sensor is to sense the vacuum changes in the intake manifold, then convert the changes in the internal resistor of the sensor into a voltage signal, which is used by the ECU to adjust the fuel injection volume and ignition timing angle. Below is a related introduction to the intake pressure sensor: The intake pressure sensor detects the absolute pressure in the intake manifold behind the throttle. It senses the changes in the absolute pressure inside the manifold based on engine speed and load, then converts this into a signal voltage and sends it to the Engine Control Unit (ECU). The ECU uses the magnitude of this signal voltage to control the basic fuel injection volume.