A steering sensing apparatus for an agricultural vehicle, the vehicle having a steering system with a rotatable steering wheel and connected shaft for directionally controlling the vehicle, a guidance system for automating vehicle directional control, and a turn indication system, said steering sensing apparatus comprising: a sensor module for detecting rotation of the steering wheel, said sensor module having first and second magnetic sensors (23, 24) and a plurality of magnetic poles, said plurality of magnetic poles generally circularly arranged about the shaft for rotation therewith, said first and second magnetic sensors (23, 24) disposed generally radially outwardly adjacent to said plurality of magnetic poles and each configured to provide a magnetic sensor signal (123, 124) having a high value or a low value indicative of the presence or absence, respectively, of a magnetic pole adjacent to said sensor (23, 24), said plurality of magnetic poles and said first and second magnetic sensors (23, 24) being positioned with respect to said plurality of magnetic poles so that the values of said first and second magnetic sensor signals (123, 124) do not change between said high value and said low value simultaneously; and characterized in that said steering sensing apparatus further comprises: a processor module operably connected to said sensor module and configured to receive said first and said second magnetic sensor signals (123, 124), and to initiate a first output (223, 224) in response thereto, said first output (223, 224) being initiated when said first and said second magnetic sensor signals (123, 124) both change value indicating movement of the steering wheel wherein said first output (223, 224) disengages the vehicle guidance system, and to initiate a second output (241, 242), in response thereto, when said first and said second magnetic sensor signals (123, 124) cycle between said high and low values in a first pattern indicative of movement of the steering wheel for a turn input in a first direction followed by cycling of said first and said second magnetic sensor signals (123, 124) between said high and low values in a second pattern indicative of movement of the steering wheel in a direction opposite of said first direction for a predetermined amount wherein said second output (241, 242) discontinues operation of the turn signal system. a sensor module for detecting rotation of the steering wheel, said sensor module having first and second magnetic sensors (23, 24) and a plurality of magnetic poles, said plurality of magnetic poles generally circularly arranged about the shaft for rotation therewith, said first and second magnetic sensors (23, 24) disposed generally radially outwardly adjacent to said plurality of magnetic poles and each configured to provide a magnetic sensor signal (123, 124) having a high value or a low value indicative of the presence or absence, respectively, of a magnetic pole adjacent to said sensor (23, 24), said plurality of magnetic poles and said first and second magnetic sensors (23, 24) being positioned with respect to said plurality of magnetic poles so that the values of said first and second magnetic sensor signals (123, 124) do not change between said high value and said low value simultaneously; and characterized in that said steering sensing apparatus further comprises: a processor module operably connected to said sensor module and configured to receive said first and said second magnetic sensor signals (123, 124), and to initiate a first output (223, 224) in response thereto, said first output (223, 224) being initiated when said first and said second magnetic sensor signals (123, 124) both change value indicating movement of the steering wheel wherein said first output (223, 224) disengages the vehicle guidance system, and to initiate a second output (241, 242), in response thereto, when said first and said second magnetic sensor signals (123, 124) cycle between said high and low values in a first pattern indicative of movement of the steering wheel for a turn input in a first direction followed by cycling of said first and said second magnetic sensor signals (123, 124) between said high and low values in a second pattern indicative of movement of the steering wheel in a direction opposite of said first direction for a predetermined amount wherein said second output (241, 242) discontinues operation of the turn signal system. a processor module operably connected to said sensor module and configured to receive said first and said second magnetic sensor signals (123, 124), and to initiate a first output (223, 224) in response thereto, said first output (223, 224) being initiated when said first and said second magnetic sensor signals (123, 124) both change value indicating movement of the steering wheel wherein said first output (223, 224) disengages the vehicle guidance system, and to initiate a second output (241, 242), in response thereto, when said first and said second magnetic sensor signals (123, 124) cycle between said high and low values in a first pattern indicative of movement of the steering wheel for a turn input in a first direction followed by cycling of said first and said second magnetic sensor signals (123, 124) between said high and low values in a second pattern indicative of movement of the steering wheel in a direction opposite of said first direction for a predetermined amount wherein said second output (241, 242) discontinues operation of the turn signal system.