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