SIZE: 115mm (4.53 Inch) PRODUCT DETAILS: Tachometer: 0 - 8,000 RPM for Diesel Engine. Gauges Requires 12 Volt Negative Ground Systems. FEATURES: High-Precision Swiss-Style Stepper Motor Tachometer Delivering Instant Vehicle RPM Readings. Featuring Opening & Closing Ceremony, This Boost Gauge Peak Recall Functionality, Includes A Daisy Chain System And An External Warning Light For Added Visibility And Fully Programmable Warning Features For Enhanced Safety. DESIGN: Designed With A Sleek Aluminum Bezel And Housing, A Smoked Lens, 3-Color Display (White, Blue, & Amber) With Adjustable Brightness. Control The External LED Color With The Convenient External Control Box. INCLUDES: Tachometer, Power Wire, Power Daisy Chain Wire, Tachometer Sensor Wire, 3 Color External LED Control Box, External Shift Light, Gauge Stand And Screws Set, RV Roll For Adjustment, Installation Instructions. One-Year Warranty For Non-Human Factor Damage & Free Lifetime Technical Support. Made in Taiwan. Gain unparalleled insight into your vehicle's engine speed with the RACETECH 80mm Performance Electrical Tachometer. Designed for automotive enthusiasts and built with precision, this advanced gauge provides instant, accurate RPM readings from 0 to 8,000 RPM, empowering you to optimize shift points, monitor engine health, and push your performance limits. Specifically engineered for 12V car negative ground systems, it’s the essential upgrade for any performance-driven vehicle.