Quick Overview Add this optional wiring harness to our ultra lightweight carbon fiber racing tach model 8199-05702 to enable the ability to interpret a digital RPM signal (which is common to most conventional performance ignition systems and ECU) instead of the NASCAR McLaren ECU CANbus which the tachometer is set up for by default. Attributes: GTIN: 00046074052583 Brand Name: AutoMeter Add-On: N/A Extended Information: Country of Origin: United States Emissions : Released Life Cycle Status: Available To Order Packing Information: Quantity of Each: 1 Package UOM: EA Dimension: 0.75 x 5.75 x 7.75 inches Weight: 0.11 lb