This invention is an annular sensor that measures {HEAD ~ combustion chamber pressure} in {TAIL ~ an internal combustion engine} 
This invention is an annular sensor that measures { HEAD ~ combustion chamber pressure } in { TAIL ~ an internal combustion engine }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL