Hi Guys.sorry for not getting back to you but i dont have internet access during the week usually.the pressure cold is about 80 psi but when hot it doesnt usually go above 40 no matter what revs.i have done 400 miles since the light came on without a repeat of the flickering lightand i now have a gauge which is an electric one and it is as useful as a chocolate fire guard.the oil is the wrong grade as i found out this week.it is fully synthetic 5-40 so i need to change it quick.i put a new set of hydraulic lifters in it and then a cam a week later.did it all wrong cause i have been told i should have fitted them together and could have knackered the cam as the lifters will have adjusted to the old one.you live and learn i suppose.now i have a noisy tappet on start up and occasionally when i am running it.i had the engine apart 6 months ago and it is as clean as an operating theatre,in fact the inside of the engine is immaculate.any other ideas?.thanks once again.steve p