involve PID into equation

[SSlisko]

My idea was to involve a PID into an equation. In fact, while using "Intake Manifold Pressure" for the boost display, I would like to have "Barometric preesure (from vehicle)" deducted. So I wouldn't have to adjust for the right atmospheric pressure and the boost gauge would show all the time the right pressure.
Right now my equation for a boost gauge with values in bar is
(a - 96.5) * 0.01
The 96.5 is kpa and stands for atmospheric pressure in the mountain region I'm living. But just a 1h 30 drive and I'm on sea level and having way over 100kpa or 1000mbar. The 0.01 is converting from kpa to bar. So my car is also showing "Barometric pressure (from vehicle)" and I have this value displayed on the AA-Torque screen, but if it would be possible to have an equation for the boost gauge as
(a - Barometric pressure (from vehicle)) * 0.01
that would be it. Set and forget!

Maybe you can help me on that matter, would be also willing for sending a tip!

[SSlisko]

SOLVED

Here the solution, if anybody else would be looking for something similar. My car is displaying "Barometric Pressure" in the Torque app, so I used this value to calculate "Boost" displayed in bar. So not needing to adjust for "Barometric Pressure" inside the Torque Pro app.

How it's done, you need to create a custom PID and in my case the Equation was
(VAL{Intake Manfold Abs Pressure A} - VAL{Barometric Pressure (from vehicle)}) * 0.01

Afterwards you can call up the custom PID in AA-Torque.