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Find an unregulated faucet. It is vital that it be unregulated because any pressure reducers will affect the pressure reading.
Install the pressure gauge by twisting it in a clockwise direction. Make sure it is firmly on the tap as leaks will affect pressure readings.
Turn the faucet slowly until it is on all the way. Let the it run for about 10 seconds to make sure you are obtaining full pressure.
Slowly turn the water off.
Unscrew the pressure gauge. It is normal to have some excess water leakage.