1953-1974 Corvette Electric Tachometer/Tach Conversion Manufactured by a GM supplier for OE accurfacy adn dependability Can be used to convert 1953-1962 mechanical tachometers to electronic Eliminates Rev counter on 1953-1958 tachometers Will not work with 1963-1964 tachometers Also fits 1965-1973 mechanical tachometers