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You do not need to measure pressure.
Follow a good loading manual.
They rarely have loads that are excessive, but to make sure use more than one.
Many of the powder makers manuals are free, and combined with a larger manual (Lee, RCBS, Hornady, etc) you should be able to verify that listed loads are realistic.
Strain gauge systems are still relative and depend critically on steel properties and carefully calibrated test ammunition with known properties.
Piezo systems also require calibration but are far less dependent on parameters outside the sensor.
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