The present invention relates to a method and devices for identifying {TAIL ~ which cylinder} is in {HEAD ~ the compression phase} 
The present invention relates to a method and devices for identifying { TAIL ~ which cylinder } is in { HEAD ~ the compression phase }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD