I have a question for Tracy and/or Ed. on pressure gauge calibration.
I am confused when it comes to calibrating the instruments
I have the Motorola MPX 4250 pressure sensors for my intake manifold and
turbo pressures.
I want to calibrate the gauges in inches.

The Question:  Do I start at sea level at (29.92") or at Zero
I think that the confusion comes from the automotive vacuum gauges that
start at zero at sea level pressure and get 30" at full vacuum.

Thanks

Rino
Getting closer to first flight