The sensor, although located in the spark plug access well, is not physically in {HEAD ~ contact} with {TAIL ~ the spark plug} 
The sensor , although located in the spark plug access well , is not physically in { HEAD ~ contact } with { TAIL ~ the spark plug }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL