Power them with the arduino 5v and use the arduino 5v as analog reference that is the arduino default setting.
Arduino vacuum gauge.
The oled screen simply plugs in over the arduino which made for a nice compact board.
This had to be changed to a 0 5vdc range using a potential divider so it was compatible with the arduino.
Absolute pressure is referenced to the pressure in a vacuum whereas gauge and differential pressures are referenced to another pressure such as the ambient atmospheric pressure or pressure in an adjacent vessel.
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When the 5v changes the resulting measured pressure does not change and is still accurate.
The vacuum gauge outputs 0 10vdc.
Luckely they have also a vacuum sensor with a large range for example the mpxv6115v.
Arduino code for air pressure measurement.
Those sensors are ratiometric.