These 3-1/8" electronic tachometers use a 250° sweep meter movement to withstand high levels of vibration, and register flight time accurately. Starting at 1800 RPM and higher, not just cruise speed. The hour meter counts flight hours at RPM settings of 1800 and higher. Power: 12-28VDC. Two-year warranty. 

*P/N 10-00119, 10-00120 & 10-00121 tachs eliminate problems associated with mechanical tach cables, and the sending unit is a direct replacement for the tach cable. All models are analog style tachs with hour meters and can read RPM for either clockwise or counter-clockwise revolutions. Sender included.