When you say you replaced the oil pressure sender and "nothing happened", was it fluctuating before, .....
....or was it not working then, AND still not working now?

__________________
Schettini
1996 S420 (45,00O)
1994 SL320 (96,000)
1992 SL500 (82,000)
1990 300E (183,000)
1993 300E (99,000) sold
1988 190D (125,000) sold