A variable geometry turbine comprising: a turbine housing having an inlet for exhaust gas and an outlet, a volute connected to the inlet and an integral outer nozzle wall adjacent the volute; a center housing attached to the turbine housing and having a center bore carrying a bearing assembly; a turbine wheel carried within the turbine housing and attached to a shaft extending through the center housing, supported by the bearing assembly; a plurality of vanes having rotation posts extending from a first surface substantially parallel to the outer nozzle wall, the posts received in circumferentially spaced apertures in the outer nozzle wall, the vanes further having actuation tabs extending from a second surface of the vanes distal the first surface; an unison ring intermediate the center housing and the vanes, the unison ring having a plurality of slots, the slots receiving the tabs, the unison ring further having a radial slot; a crank shaft having a pin engaging the radial slot, the crank shaft movable continuously from a first position to a second position, movement of the crank shaft causing the pin to translate in the radial slot and impart force perpendicular to the radial slot to urge rotational motion of the unison ring, the rotational motion of the unison ring causing the tabs to move in the actuation slots; an oil control valve for moving the crank shaft from the first position to the second position wherein the oil control valve includes an electric actuator and a valve stem, wherein the valve stem is mechanically isolated from movement of the crank shaft; and characterized in that the variable geometry turbine comprising an electronic sensor for sensing an angular position of the crank shaft a member of the sensor rotating. a turbine housing having an inlet for exhaust gas and an outlet, a volute connected to the inlet and an integral outer nozzle wall adjacent the volute; a center housing attached to the turbine housing and having a center bore carrying a bearing assembly; a turbine wheel carried within the turbine housing and attached to a shaft extending through the center housing, supported by the bearing assembly; a plurality of vanes having rotation posts extending from a first surface substantially parallel to the outer nozzle wall, the posts received in circumferentially spaced apertures in the outer nozzle wall, the vanes further having actuation tabs extending from a second surface of the vanes distal the first surface; an unison ring intermediate the center housing and the vanes, the unison ring having a plurality of slots, the slots receiving the tabs, the unison ring further having a radial slot; a crank shaft having a pin engaging the radial slot, the crank shaft movable continuously from a first position to a second position, movement of the crank shaft causing the pin to translate in the radial slot and impart force perpendicular to the radial slot to urge rotational motion of the unison ring, the rotational motion of the unison ring causing the tabs to move in the actuation slots; an oil control valve for moving the crank shaft from the first position to the second position wherein the oil control valve includes an electric actuator and a valve stem, wherein the valve stem is mechanically isolated from movement of the crank shaft; and characterized in that the variable geometry turbine comprising an electronic sensor for sensing an angular position of the crank shaft a member of the sensor rotating.