t comes with an air release ("bleed") button to release excess air.
Looking to get this type of gauge so I can over-pump at the petrol station and then go home ... and then some time late at night release the excess air when the tyres are cold and get the right tyre pressure.
FYG if you pump your tyres at the petrol station to your desired pressure when its hot or you have been driving for some time, the pressure can drop by as much as 30kpa once your tyres cool down.