Profile: Autonnic Manufacturing, Inc. is a designer and manufacturer of tachometer & engine usage meters. Our meters are comprised of a patented sensor and plastic case that is fitted with a computer chip & a liquid crystal display screen, that attaches to an engine by a sensor lead wire. It is also used in spark-ignited internal combustion engines, or engine powered equipment. Our ARM126MK2 is a single bolt, clip-on, self contained water resistant, engine operating hour log, or engine hour meter designed for military applications.