ok guys got the new TSP shortblock in and everything else. did the two break in cycles like TSP recomends. At first start showd 40+psi and through both breakin cycles. After changing the oil and starting it to check for pressure, 40psi again, we shut it down for the night. today started right up but didnt show any pressure, weve checked everything we can think of except for pulling the front end apart. any help will be greatly appreciated thanks in advance

 

Put a manual oil pressure gauge on it. If you have pressure, then it is the sensor at the back of the block. If you don't have pressure, start tearing it down. Make sure the o-ring is in good. Did you get an LS6 oil pump? Last things to think about would be bearings. I wouldn't think it would be that, but you never know.