SIZES: 85mm (3-3/8"). Tachometer Requires 12 Volt Negative Ground Systems. FEATURES: The Tachometer Reads Signals From The ECU, Suitable For 1 To 9 Cylinder Gas-Powered Engines. Please Note: Reading The Signal From The Coil (-) Is Not Recommended. Tachometer with Historical Peak Recall & Programmable Warning Function. FEATURES: Applying Latest LCD Movement Technology with Precision Display. 4 Color Switchable Displaying Backlit, with 6 Level Brightness Adjustment Available. 4 Color: Blue, Red, White & Green. FEATURES: Flat Clear Acrylic Lens, Black Aluminum Bezel & Black Plastic Housing. PRODUCT DETAIL: Tachometer 0 - 11000 RPM. PACKAGED: Tachometer, Power Harness, Daisy Chain, Mounting Cup & Stand, Mounting Hardware, Installation Instructions. One-Year Warranty For Non-Human Factor Damage & Free Lifetime Technical Support. EVO SERIES DIGITAL TACHOMETER.