Pulled the engine with 100k did a full rebuild. Had the block machined, new piston rings, built the head etc. Dropped it in, primed the engine by pulling fuel pump fuse and turning it over to get oil going. Car starts right up after priming, sounds good, a little loud but nothing out of sorts, engine quiets down and sounds great. WARNING LOW OIL PRESSURE light comes on. I turn it off immediately. I’m looking for opinions and recommendations. The car sat for almost 2 years while I built it. Tomorrow I will replace the oil pressure sensor next to the oil filter. If that does not fix it I’m a bit lost on where to go from there. Please ask any questions that may help provide a diagnosis. Thanks in advance.