A sensor plug for use in sensing a plurality of operating conditions of a gearbox is disclosed. The sensor plug includes a body defining an axis. A probe end is formed at one end of the body and is particularly adapted for attaching to an oil drain plug of the gearbox. A plurality of sensors are located...http://www.google.de/patents/US6425293?utm_source=gb-gplus-sharePatent US6425293 - Sensor plug
