Which value should takes to show Gauge value, Fuel pressure or Intake Manifold Pressure?

Question

Currently, I'm working on an app which should show Gauge value (inHg) of the vehicle using OBD reader. Which values should I use to show the Gauge? Is there any formula?

Solar Mike · Answer

Gauge pressure (GP) is linked to absolute pressure (AP) by atmospheric pressure as in :

AP = GP + atmos p

Units can be Bar, Pascals, psi, mmH2O, inHg etc

But you can have them selected based on location ie Bar works well in Europe, psi in UK etc

Which value should takes to show Gauge value, Fuel pressure or Intake Manifold Pressure?

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