Abstract: A tire pressure monitoring system for vehicles characterized by a plurality of tire pressure sensors for sensing pneumatic pressure interiorly of the tire, a plurality of transmitters connected responsively with the tire pressure sensors and adapted to be energized when any one of the tire pressure sensors indicates a low pneumatic pressure within one of the tires; at least one receiver responsively disposed with respect to the transmitters so as to be energized by a transmitter when the transmitter is energized by the tire pressure sensor and a warning means, including a buzzer and a light, disposed in the operator's cab for conveying the warning to the operator when a low tire pressure is sensed, the warning means being electrically connected with the receiver, or receivers, so as to be energized when the receivers are energize.