The cost of new one in PL is 450zlotych (about 150$).

If your sensor is broken, or display too low oil pressure on the dashboard - u can easly fix it. All you need is small metal saw and extraction petrol for cleaning.
You need to open it, and carefully clean the slider . Check the resistance, it should be about 273R.






The movie presented repaired oil pressure sensor: http://www.youtube.com/watch?v=uc-YbWOR0oo

Gl & hf

ps. sorry for my not so good english

Good tip, it's known those sensors start to perform less after 10 years or so.