[A8] 1998 A8 oil pressure alarm intermittent

[FBFISH at aol.com]

Guys- It has been a long time since I last posted because the car has been 
very reliable. It only has 89k on it, and otherwise runs great. I have 
always used synthetic oil, except on the last change when I reverted to regular 
oil (do not ask why). I thought I would check around to see if anyone else 
has had this problem before I go poking around. BTW, anyone know where the oil 
pressure sensor is located? TIA
Frank Santoro
1998 A8
1990 V8 gone but not forgotten