electronic means suitable for causing {HEAD ~ the spark} in {TAIL ~ the spark plug} in each cylinder whose piston is located near a top dead centre as identified by a sensor placed on a crank shaft 
in
electronic means suitable for causing { HEAD ~ the spark } in { TAIL ~ the spark plug } in each cylinder whose piston is located near a top dead centre as identified by a sensor placed on a crank shaft
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH