Open a 3-3/8 inch diameter and 2-3/4 inch depth hole, insert the gauge, and secure it in place. Easy installation with 3-wire connection: power, ground, and lighting. This is a complete unit that works directly with a GPS sensor—no additional sensor cables required. Mount the sensor at any position, on or under the dashboard. It takes approximately 30 seconds to acquire signal the first time, and less than 3 seconds afterward. Signal acquisition is faster under a clear view of the sky. If signal is lost, reconnect all wires and restart the device. Displays current speed and odometer (cannot be reset); no trip meter function. Features: - Low power consumption - Long service life - High precision - Fast location confirmation - Short startup time Specifications: - Speedometer range: 220 km/h - Voltage: 12V/24V - Universal fit for most models - Color: As shown in image - Material: ABS + metal - Size: 75mm x 90mm x 85mm Package Contents: 1 x 220 km/h Speedometer 1 x English and Chinese Manual 1 x Multi-plug Socket Note: Lighting and display differences may cause slight color variation between the image and the actual item. Measurement error allowed within +/- 1-3 cm. Only the items listed above are included; other accessories are not part of the package.