my mk4 escort 2.0 zetec runs on rs2000mk5 management.

i currently run 1 hego sensor and car runs quite well but im sure it cant be spot on.
i have a wiring diagram here and it says that each sensor has 1 seperate pin each in the ecu.
if you unplug 1 sensor does it sense of the other sensor and use that reading?
or can i wire the two together?
i only have 1 hego hole and cant get another one welded in without alot of agro.

also can i short circuit the power steering switch so it revs the engine higher all the time on tickover?
need higher tickover for my setup