Sensor for tire pressure and tire pressure monitoring system having the same

An apparatus comprising:

• a first tire-pressure measurement sensor that includes:
• a pressure detector configured to be mounted to a wheel of a tire outside the tire and to measure an air pressure in the tire;
• a wireless transmitter operatively coupled to the pressure detector and configured to wirelessly transmit a value representing the measured air pressure from the pressure detector to a remote display in a vehicle;
• a conduit having an air passageway, wherein the conduit is connected to the pressure detector and includes a connection pipe and a connection-pipe attachment mechanism configured to fasten the connection pipe to an outside end of an air-injection stem of the tire such that the air passageway is connected to the air-injection stem and extends between the air-injection stem of the tire and the pressure detector;
• and
• an air-injection port connected to the air passageway, wherein the air-injection port is configured to receive injected air and pass the injected air to the air-injection stem of the tire through the air passageway.