Tire Pressure Monitoring System Kit with 4 Internal Sensors and LCD Display The MT-I4 is a complete aftermarket tire pressure monitoring system for vehicles that left the factory without TPMS, or for owners who want a reliable display instead of a dashboard warning light. Four internal clamp-in sensors mount inside the wheel, protected from theft and kerb damage, and report to an LCD monitor with a loud buzzer alarm. It is the same architecture used by commercial fleet tire