General Technologies Corp GTC TA300 Smartach D Digital Diesel Engine Tachometer For 1 to 12 cylinders and 2 or 4 cycle engines Measures from 200 to 20000 RPM on a 4-1/2 digits LCD display Advanced microcontroller technology yields 0.1 percent accuracy User adjustable signal threshold level from 20 percent to 80 percent Universaltransducer clamp attaches quickly to fuel injection lines