Features Accurate RPM Measurement: Ensure accurate measurement on the operation speed of your dieselmotor engine RPM with this 85mm tachometer. Wide Voltage Range: Works perfectly with a voltage range of 9 to 32V DC, suitable for various dieselmotor engines, and the test range is 4000RPM. Low Power Consumption: With a working current of ≤60mA, this tachometer consumes minimal power during operation. Practical Use: The waterproof tachometer is very clear to read, which suits perfectly for generator sets, instrument boxes, and other machinery. Durable and Reliable: Crafted with premium ABS materials, this tachometer offers long lasting performance and reliability. 1. Accurate RPM Measurement: Ensure accurate measurement on the operation speed of your dieselmotor engine RPM with this 85mm tachometer. 2. Wide Voltage Range: Works perfectly with a voltage range of 9 to 32V DC, suitable for various dieselmotor engines, and the test range is 4000RPM. 3. Low Power Consumption: With a working current of ≤60mA, this tachometer consumes minimal power during operation. 4. Practical Use: The waterproof tachometer is very clear to read, which suits perfectly for generator sets, instrument boxes, and other machinery. 5. Durable and Reliable: Crafted with premium ABS materials, this tachometer offers long lasting performance and reliability. Specification: Item Type: Tachometer Working Voltage: 9-32V DC Working Current: ≤ 60mA Working Temperature: -30~+75 ℃ Storage Temperature: -40~+85 ℃ How to Use: Wiring: 1. Red Wire: 9‑32V DC 2. Black Wire: Sensor Signal 3. Orange Wire: Backlight + 4. Blue Wire: Power Supply ‑ Package List: 1 xTachometer 1 x Connecting Cable 3 x Accessory 1 x User Manual Package List 1 x Tachometer 1 x Connecting Cable 3 x Accessory 1 x User Manual