using an autometer electrical oil pressure sender, i tapped off the back where the factory sender is, i put a -3an hose about 16" long and t'd off to the autometer sender and a feed for the turbo, but the sender is only reading approx 10psi of pressure?? is this because of the distance? what should factory oil pressure be at?? i know i'[m getting oil cause i removed the line and when running oil comes out.