wheres my oil pressure.. urgent!!!!

[minuz689]

at first my timing chain guide broke... so i took EVERthing off and replaced my guide... started it up and still had the same knocking problem with the slack in the chain... so i replaced my tensioner chain and tension guide... and still rattling around... so i figured it was my oil pump not buildin pressure... so i relpaced the oil pump with a new one... at first all the pressure was up... had oil droppin on the cam and everything... then... nothing... no pressure anywhere and the chain is still rattling... any help at all???? desperate... need car for school monday!!!