I would suggest a careful consultatation of the Haynes manual electrical diagrams or trying to locate the buzzer by ear. I'm afraid I don't know where the little bugger is.
The thing which worries me is that the low pressure and high pressure sensors are on different circuits and if they are both alarming and you have replaced the sensors.......
Bear in mind that if you have a blocked gallery due to a gasket having eaten itself at some stage you may well end up with normal oil pressure at some points but with hideously low oil pressure at others.
If you're 1000% sure the oil pressure is alright go for
the buzzer removal or
- Try shorting out the connection to the sensor to earth and see if that stops it - alternatively just take off the wire from the sensor (I don't know if the sensor open circuits or close circuits if there's a fault you see) In theory one should stop the buzzer buzzing as it will seem to the system that the sensor is saying everything is A OK.
If the later suggestion works and your sensor is working correctly you may well have an oil pressure problem
Let us know how you get on and GL [
--- The back is covered in mud, the heater switch has lost positions 1 and 2, the rear window fogs up all the farqing time....Can ya tell what it is yet Golfaroo's? ---