Function: The PSI tachometer is used for real-time turbine pressure monitoring, with low power consumption, long life, high accuracy, and short startup time. Parameter: Boost readings from 0 to 30 psi, gauge with black dial, clear lens, and illuminated red needle; outer diameter is approximately 2 inches (52 mm). Features: This 7-color boost gauge allows you to quickly and accurately check your boost levels for precise PSI adjustment. You can choose from blue, green, red, bluish green, yellow, purple, or white. Fine Workmanship: Professionally manufactured with exquisite craftsmanship and unique design for stable performance and high reliability. Application: Easy to install with good durability and impact resistance. Package includes filter and manual for easy installation. Suitable for petrol-powered modified models. Specification: Item Type: Turbo Boost Meter Material: ABS Outer Diameter: Approx. 2 in (52 mm) Color Options: Blue, green, red, bluish green, yellow, purple, white Application: Suitable for petrol-powered modified models How to Use: Connect yellow wire to light switch (12V) Connect red wire to battery Connect green wire to sensor (green) Connect black wire to battery Package List: 1 x Meter 1 x Filter 1 x Leather Tube 1 x Tee 1 x Cable Sensor 1 x Manual 1 x Harness