thought i was leaving oil drips every where,

thought it was rocker cover gasket, as some slight oil along front edge and down right side, so changed it the other day, seems dryer now, around the top, but looked today and its quite bad still,

the sensor with the rubber boot on it, a single spade connector, that rubber boot is full of oil! i emptied it the other day, and i just squeezed it and loads more came out, guessing it shouldnt be full of oil,, is it the oil pressure sensor? is it the likely suspect, and are they easy to change?
cheers