Unplug your pressure cooker and disassemble it until you can access the pressure sensors.

Use a spudger to pry away the white adhesive covering the high pressure sensor calibration screw.

This reveals the calibration screw's flat screwhead.

If your pressure cooker is over-pressurizing, use a screwdriver to turn the screw clockwise (tighten) by a quarter turn. This makes the sensor trigger and turn off at a lower heat.

If your pressure cooker is under-pressurizing, use a screwdriver to turn the screw counter-clockwise (loosen) by a quarter turn. This makes the sensor trigger and turn off at a higher heat.

Reassemble the pressure cooker and perform the pressure test in the previous step. Readjust the calibration screw as needed.

Once you've calibrated the pressure cooker, cover the calibration screw with some silicone or heat-tolerant adhesive. This prevents the calibration screw from turning.