Traditional incandescent lighting illuminates around the perimeter of the dial. Gauge kit includes bulb and socket assembly red and green bulb covers mounting hardware and installation instructions. Tachometer is compatible with 0.5 - 6 pulse ignition signals (1-12 cylinder engines) with points electronic and most 12V high-performance racing ignitions.. Reprogram at any time to accommodate changes in gear ratio or wheel and tire combination with a simple push button 2 mile drive calibration.. Speedometer is compatible with most two wire sine wave and three wire hall effect vehicle speed sensors.. Speedometer can be easily calibrated using the trip reset button on the from of the unit and a premeasured two mile distance.. No dip switches!