Only 1 plug per vehicle is required-Just the drivers seat. Can-Am Engineers designed the drivers side seat belt assembly with a speed governor. The seat belt sensor limits the vehicle's speed when the seat belt is not plugged in. When replacing the factory seat belts with aftermarket harnesses our bypass plug is the solution. Simple plug and play unit- no wiring or modifications needed. YOU ONLY NEED 1 PLUG PER VEHICLE-JUST THE DRIVERS SEAT. Simply follow the wires from you OEM seat belt to the connection point in the harness-disconnect and install this plug. Be sure to zip tie the new plug in a spot where it will not be hit by moving parts or seat sliders. Please wear a seat belt/safety harness at all times. We want your return business for life.