Tcbakerxx

Alright so I just rebuilt my motor in my 08. I fired it up the other day and noticed my oil pressure light was flickering and my oil pressure gauge was reading 0. So I pulled the sending unit to see if i was getting oil and yes plenty of oil. So I went ahead an ordered a new oil pump. I threw it in and it's still flickering and reading no oil pressure. But I have oil. I'm stumped. Any ideas?