UMA electronic aircore propeller tachometers connect to a tach coil calibrated to the proper rather than engine RPM. These instruments are available in 3-1/8 inch, 2-1/4 inch, and 1-1/4 inch sizes.This UMA electronic tachometer (EDMO# 19-811-101) is 3-1/8 inch, designed for 4 cylinder engines, and has a built-in hourmeter.
