ok i just had the oil filter and antifreeze done on my zed, before it pressure would sit around 4 and go up with revs accordingly,

 

after service of standard filter and magnatex 10 40 oil the pressure seems really low and almost below the first marker without a number sometimes, then it settles out to arround 4 under normal driving, its a j spec btw, now i checked it several times and its definately not leeking or burning oil out the zorst, i put in the recommended 3.5 litres and its showing right near the max on the dipstick, am i worring too much or is it a dodgy sensor.

I have never had this problem myself....but it may be because I use Castrol RS 10/60

 

Are you sure its the right kind of engine oil for the Z?

Like you Ammar I only use Castrol RS 10/60;)

 

However IMHO the problem that beermonster is having,Is the stock oil pressure sensor,It is Total shite! to put it nicely;):)

 

Buy a new one for around £80,or go for an aftermarket one.

Yep, Iain's right mate, stock oil pressure sensor is cack bud. I had mine replaced at the cost of 80 squids plus fat but I would say get an aftermarket gauge. More accurate and costs alot less! Bargain all round!