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.