Rino,
I'm not Tracy or Ed, but I'd advise against calibrating anything in inches.
I would display MAP since that's what the engine sees.  The engine doesn't
know or care what caused the pressure (low altitude or high boost).  Tracy
can speak to this better than me, but I'm certain his fuel control measures
MAP and most likely in inches Hg.  That has been the aviation standard since
boost got invented in the '30's.
Eliminates a lot of confusion .... Jim S.

Rino wrote:

> 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
>
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--
Jim Sower
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T