{HEAD ~ Movement} of the first wall relative to {TAIL ~ the second wall} due to varying combustion chamber pressure transmits a load to the sensor 
relative to
{ HEAD ~ Movement } of the first wall relative to { TAIL ~ the second wall } due to varying combustion chamber pressure transmits a load to the sensor
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH