As the shaft deflects as the draft varies the magnet will be shifted towards and away from {HEAD ~ the sensor} causing {TAIL ~ a voltage variation} in line  
causing
As the shaft deflects as the draft varies the magnet will be shifted towards and away from { HEAD ~ the sensor } causing { TAIL ~ a voltage variation } in line
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH