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0-6000RPM with red or yellow backlight. 9-32V DC (12V DC/24V DC)Working Voltage Speed Ratio:0.5-250.0 Adjustable,You can press the button back to adjust it. Idle speed is usually 600-800 RPM. Details refer to the installation instructions. Suitable for diesel and petrol engines. Speedometer can receive signal from engine, ignition coil, crankshaft sensor or speedometer sensor (sold separately) etc. If you need a speedometer sensor, please search for ASIN NO. B0746FCW23 or B0746F56KN Waterproof and dustproof. Work up to 1 m underwater. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.