How to use the air pump to blow air into your tire

I do it at our station at San Pasqual Mobile
1. If you don't want to buy the air, simply buy gas there and tell the station guy to give you free air in return, other wise, insert three quarters and the pump will start


2. there are two states of the nozzle. When you insert it into your tire without pressing the handle, you will be measuring the inside pressure (each tick is 0.2 units, five ticks make a 1 unit); When you insert and press the handle, you are blowing in air without measuring the pressure.
3. First measure the pressure, and then briefly press the handle to blow in air and release the handle to quickly check the pressure. By adjusting the intervals of each state (measure/blow) you will try to push the pressure close to the desired level
4. Be sure to do everything quickly since the time is limited. And be sure to put back the caps of all your four tires.
5. After several minutes, your warning will disappear .

My tire's upper limit is 40 psi and I tried pushing the pressure up to the upper limit and drived carefully. It works.