Turbo Speed Sensor KitTurbo Speed Sensor Kit Turbo Speed sensors are critical in accurately identifying how fast the turbo is spinning and where your engine is operating on the compressor map. Traditionally, installing these sensors was difficult for the end user requiring complex machining at a compound angle to carefully hit the contour area of the wheel bore at the right angle. The latest generation BorgWarner and Garrett G turbos have this precision machining already