Since 1921, VDO automotive, nautical, aviation and industrial instruments have been unsurpassed for accuracy and reliability. Total commitment on quality has helped VDO become the world's largest independent manufacturer for automotive instruments and the original chocie of many of the world's most prestigious marque including Porsche, BMW, Mercedes Benz and Rolls Royce among others. From tachometers, speedometers, pressure and temperature gauges to volt meters and ammeters, VDO instruments are designed to accurately monitor a broad range of engine functions and environmental conditions. For engineering innovations, design excellence and production craftmanship, VDO is the standard by which all other instruments are judged.