Make sure that your controller has a Meter function or phase velocity line. Our Votol/LB controller with this function can be directly plugged in. Please Check if this display function is suitable . Two kinds of display speed signals Phase speed signal: The instrument interface does not display the gear position, and does not display the fault function. The speed is converted according to the output voltage of the controller, and there is an error. signal: The instrument interface displays the gear position and displays the fault function. The speed is subject to the signal of the controller, and the speed display is relatively stable. recommend! Function Three gears: 1, 2, and 3. If the controller has communication, three gears can be displayed, other methods such as phase speed will not be displayed. Fault light: including main fault light, motor fault, controller fault, throttle fault If the controller has communication, the fault light can be displayed, other methods such as phase speed will not be displayed. Headlight: The brown wire connects to your headlight. Turn left: the orange line connects to the left light. Turn right: the light blue line connected to the right light. Speed: Maximum. 99kmh (bulk order can be changed to ) TotalMeilage: cumulative display. Electricity: A total of five bars of battery display, depending on your overvoltage and undervoltage. If the voltage data is incorrect, there will be some errors in the battery display. Charging warning: When the battery is low, the charging warning light will be on. Voltage exchange: 60V, 48V and 72V. If your electric vehicle is 60V, the conversion line connection is dedicated for 60V. If your electric car is 48V or 72V, the conversion line is disconnected, and the two voltages of 48V and 72V arecommon. Colour: black Material: plastic Package Contents: 1 * Electric bike speedometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.