if i recall correctly only the svtf has the plug.
of course my plug leaked, fixed that, then the housing cracked awhile later. ordered a new housing, the wrong one was sent. the plug hole was molded shut and so was the top sensor hole. i modified it and drilled the top sensor hole and used a coping saw to cut the grooves for the sensors keeper. no more worrying about the plug leaking! altho the sensor was a pita, the old oring fit loose, but a new one went in snug. i can get the housings part number if anyone wants and do a writup on how to mod it.