Can you tell me where is oil pressure sender located and how to check is it in good condition. I assum that I must measure the voltage or...
Not sure as the 155 as they were never sold in OZ .
I think it is just above the oil filter and screwed ito the engine block...but I could be wrong ! On the older series of Alfa Romeo engines it was into the block about no 3 cylinder and under the inlet manifold.
But normally the resistance of the sender changes with engine revs so can ve checked with a multimeter.
Does it have a gauge or light. If a gauge then it could be faulty. The one in my old Alfetta GTV used to go to full pressure on turning the ignition. The oposite problem to yours.
It's going to be the sender unit. It is a small egg-cup shaped/sized thing, with a wire leading to it. It'll be screwed into the block on the right of the engine somewhere (as you look at it with the bonnet open), - maybe on the end facing the battery - depending what model you have.
Can't believe it!! Not only oil pressure gauge isn't working but the oil temperature gauge also is not moving. How big possibility is that this hapeneds?!? Oil level is OK. Tomorow I am going to check the wireing and sensor resistance.
Ralph's probably right- it'll just be the sender unit.
Does your oil pressure light go off when you start your engine? If so it's just a fault in sender/guage circuit. 90% chance its the sender or the wire has fallen off it.
The oil temperature guage won't move off its stop until the oil is hot enough to fry chips in, so I wouldn't worry about that one either.