... ’re running a different tire pressure, you will need to re-calibrated the sensor to memorize the new pressure valueHow to use it ... cover, to calibrate and memorise the tire pressure, firstly insert Metal key into the sensor like shown below and rotate then centre ... , if you want tire pressure sensor to blink at 30psi, you should calibrate the sensor at 30psi, secondly inflate tire to 31psi or higher ...