Trigger wheel 138mm / 78mm (60-2) Trigger wheel for which fits aftermarket ECU to get crankshaft signal. These are available in 36-1 or 60-2 resolution which is preset in all aftermarket control systems. Used in conjunction with a Hall or VR sensor connected to the ECU. Mounting of the trigger wheel must be done on the crankshaft pulley / adapter. The sensor is then mounted at a distance of about 0.5-1mm to the trigger wheel. The sensor should also be centered on the trigger wheel. If the gvar is mounted too far away or if the trigger wheel throws, the signal to the ECU will be worse. Dimensions: Outer diameter: 138mm Inner diameter 78mm Thickness: 3mm Material: steel Teeth: 60-2 Track width for M6 bolts   See picture for placement of sensors.