Industrial SG202-46814 Tachometer Sending Unit

Industrial SG202-46814 Tachometer Sending Unit is an Electrical Tachometer Transmitter designed for installation on USGI M977-series HEMTT transfer cases to supply a tachometer signal to the vehicle’s instrumentation. It carries the National Stock Number 6680-01-109-3930 and appears in catalogs under SG202-46814, with alternate references 104700 and 104700-B. The unit is manufactured by AMETEK Inc., doing business as AMETEK DIXSON DIV DIXSON, based in Grand Junction, Colorado. Key physical specifications documented for this transmitter include a 1.130-inch distance across flats, a 3.750-inch adapter length, and a 15.000-inch wiring harness, which define its mounting and cabling footprint in the transfer-case tachometer system. As a dedicated tachometer transmitter, the SG202-46814 variant is intended to generate a suitable electrical signal from the transfer case’s rotating speed for attachment to the vehicle’s tachometer gauge, enabling accurate RPM readouts in the M977 HEMTT family. The part’s inclusion in government NSN catalogs and multiple vendor listings underscores its role as a factory component for military off-road heavy vehicles, rather than a generic aftermarket sensor.