If your vehicle does not have a vehicle speed sensor (VSS) wire, you'll need to use the KVPG1 speed pulse generator with the KD-NX5000 navigation receiver to ensure proper operation of navigation features. . The KV-PG1 provides a manual speed pulse signal for JVC In-Dash Navigation units. For installation in vehicles that do not provide a usable Vehicle Speed Pulse signal or use a digital signal system.