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