1、MARINE GRADE: The 85mm pointer type tachometer is made of 316L stainless steel front cover and anti fog curved glass, suitable for harsh marine environments with IP67 waterproof and dustproof rating. 2、ACCURATE DISPLAY: Equipped with a stepper motor driven pointer, this tachometer is suitable for various vehicle modifications and can accurately display cumulative hours from 0.0‑99999.9H with 7 adjustable backlight colors for night driving. 3、WIDE VOLTAGE DESIGN: The gauge features a wide working voltage range of 9‑32v, up to 36v, with low power consumption, long lifespan, high accuracy, and quick start up time. 4、STABLE CONNECTION: The gauge's connection harness with buckle design ensures secure connectivity, allowing the tachometer gauge to operate even under strong vibrations. 5、VERSATILE APPLICATION: Suitable for various engines, generator sets, ships, construction machinery, agricultural machinery, and automotive modifications, perfect to meet your needs. Item Type: Tachometer Size: Approx. 85mm / 3.35in Material: 316L Stainless Steel Bezel + Fog Proof Glass Accumulated Hours: 0.0-99999.9H Guard Level: IP67, Fully Waterproof, Excellent Anti Fog Function Input Signal: Stepper Motor Backlight Color: Red (Default), Green, Blue, White, Yellow, Yellow Green, Orange, Purple Working Current: ≤60mA Operating Temperature: -30°C to +75°C Storage Temperature: -40°C to +85°C Guard Level: IP67, can work underwater at 1m depth Wiring: 1. Red Wire - +9-32VDC 2. Black Wire - Sensor Signal 3. Orange Wire - Backlight (+) 4. Blue Wire - Power Supply Negative (-) 1 x Gauge 1 x Mounting Base 1 x Power Cord 2 x Nut 1 x User Manual