2" 52mm 7-color high-speed car water temperature, oil temperature, oil pressure, air-fuel ratio, boost, voltmeter, EGT meter, tachometer RPM car instrument Features: 1. High-speed stepper motor for quick response. 2. Built-in alarm function; alarm backlight flashes red when triggered. 3. Clear and bright adjustable 7-color LED backlight. 4. Lens-mounted button allows switching between light colors (refer to product page video for details). Includes gauges for boost, water temperature, oil temperature, oil pressure, exhaust gas temperature (EGT), and tachometer with included sensors. Note: Air-fuel ratio gauge does not include sensor; sensor must be purchased separately. Compatible only with narrow band oxygen sensor. Sensor thread size: 1/8ZG. Item includes English installation instructions and high-end racing-grade gauges. Specifications: - Tachometer: 0–10,000 RPM - Boost gauge: -30 to 30 PSI - Water temperature gauge: 40–140°C - Oil temperature gauge: 40–140°C - Oil pressure gauge: 0–100 PSI - Voltage gauge: 8–18V - Air-fuel ratio gauge: 20:1 to 10:1 - Exhaust temperature gauge: 3–13100°F Note: Available with or without gauge stands; please select the correct option. After receiving the gauge, it is normal for the pointer not to read zero when powered off; operation is normal when powered on. Accessories included (see package contents image): - Tachometer - Boost gauge (PSI) - Boost gauge sender - Water temperature gauge - Oil temperature gauge - Oil pressure gauge - Voltmeter - Air-fuel ratio gauge - Exhaust temperature gauge Suitable for 12-volt gasoline vehicles. Tachometer compatible with 1- to 8-cylinder engines.