The ATH-40-A tachometer/hourmeter with black stainless steel bezel is a rugged instrument with solid-state circuitry for indication of engine RPM and elapsed engine running time. It is equipped with a ring nut for mounting into a standard 3-3/8 in. (86 mm) dash mounting hole. A full 240ø sweep of the pointer gives an accurate indication on a large easy to read scale, and the dial can be illuminated for night reading.