AutoMeter Sport-Comp Monster Tachometers 3900

Traditional incandescent lighting illuminates the front of the dial 12 and 16 volt compatible, well-suited with nearly every street car or race car electrical system AutoMeter's race proven air-core electric tachometers provide quick and accurate readings with a needle so responsive it can go from 0 - full scale in 333 milliseconds Compatible with 1, 2, 3, & 4 pulse per revolution ignition RPM signals (2, 4, 6, & 8 cylinder engines) with points, electronic, and most 12V high-performance racing ignitions.