An angular position detector generates a reference position signal representative of a predetermined crank angle of each engine cylinder in {HEAD ~ synchronism} with the rotation of {TAIL ~ an internal combustion engine} 
An angular position detector generates a reference position signal representative of a predetermined crank angle of each engine cylinder in { HEAD ~ synchronism } with the rotation of { TAIL ~ an internal combustion engine }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL