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. Alarm function with red flashing backlight 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). 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 and requires a 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: 3–1310°C Note: Available options include gauge only or gauge with mount. Please select the correct version. After receiving the gauge, it is normal for the pointer not to read zero when powered off. The gauge will function properly when powered on. Compatibility: Suitable for 12-volt gasoline vehicles. Tachometer is compatible with 1- to 8-cylinder engines. Package includes (see product images): - Tachometer - Boost gauge (PSI) - Boost gauge sensor - Water temperature gauge - Oil temperature gauge - Oil pressure gauge - Voltmeter - Air-fuel ratio gauge - Exhaust temperature gauge