Quick view VDO Kitas4 Smart Tachograph speed sensor Release 1.21- Element length 18.6mm VDO 2185-2000020004-A3C1008690021 Smart tachograph sensor: Kitas4 Release 1.21 Replaces Kitas 2+ 2171-20002115 Brands: See specifications Thread: M18x1.5 Sensor (L) = 18.6mm