This is the Onboard Digital Tachometer for use with the DLE 25-55 Engines. FEATURES: Mini tachometer indicates up to 30,000RPM Uses high-brightness LED digital tube Standard Futaba plug INCLUDES: One Onboard Digital Tachometer One Y-harness REQUIRES: Installation between the HALL sensor and the ignition SPECS: Input Voltage Range: 3.5-8.4V Current Consumption: 25mA-60mA Body Size: 41mm x 17mm x 12mm (1.6"x0.67"x0.47") Window Size: 30mm x 15mm (1.2" x 0.59") Weight: 8.5g (0.3oz)