Tachometer And Tachhourmeter.

Frank W. Murphy is offering an addition to its line of tachometers/hourmeters, the AT series Tachometer and ATH series techometer/hourmeter. These transistorized instruments feature solid-state circuitry for indication of engine rpm. They are equipped with a bracket for mounting into a standard 3 3/8 in. dash-mounting hole. A 270[degrees] sweep pointer gives accurate rpm indication. Dial illumination for night reading is available, the company said. ATH series models also record the elapsed running time of an engine. The power source is provided by either a magnetic pickup or a battery-charging alternator. All models are for negative ground, positive ground or isolated electrical systems.