Hi guys, i am new here. i have a 94 altima gxe. my problem is that i installed new tensioners, chains, and guides on it, and now it has no oil pressure. it is really loud on the top end like a valve clearance problem. i took everything back apart and seemed fine. i bought a new oil pump from Nissan, and istalled it. started the car and it was still noisy, but it 45 psi. took it for a drive and the oil light came back on after about 5 miles. put a manual gauge, oil pressure was at 0-5 psi. Am i overlooking somethin or what?