Petrol engines low oil pressure
If the oil light comes on whilst you are driving stop immediatley it is safe to do so. There is a buzzer which may go off and give you a heart attack as well, sometimes the buzzer is disconected by a previous owner as they can be unreliable and annoying if pressure system checks out OK.
To test oil pressure you need a oil pressure tester that screws into the hole that your oil presure low oil switch fits, that's the one between the pushrods on 3 and 4.
HarryMann There are two (sensors), what are called high and low pressure, the normal higher pressure one (.9 bar) is in a really awkward spot somewhere down between the water pump and pulley area. The low one (.3 bar) is under the nearside cylinder head, measuring the supply pressure to the top end oilways.. they work in harmony (allegedly) connected in series ? ... one is open circuit and one closed circuit by default and the circuit continuity checked against a 2000 rpm break-point. The way its wired, one is being tested above that speed and the other below it. We need an accurate description for the Wiki so will try to find one...
The wires come in from the front nearside corner of engine bay... your problem may well simply be bad contacts at the instrument cluster, the multi-ribbon connector may have corroded a bit - careful around there, take out ribbon, clean and refit, test etc.
