The oil press gauge is on the low pressure side of the oil system. The high pressure side of the engine is fed oil from the low pressure side. There are multiple things with the high pressure side and leaks, most of them don't affect the low pressure side though. Significant high pressure leaks can cause low oil pressure concerns though. Typically HP oil leaks start showing up on hot engines, and go away or are not as bad on cold engines, reason is the HPOP can pump enough colder/thicker oil to overcome the leak, but cant pump the hot/thin oil quick enough.
Not that you really need to read the actual ICP (high pressure oil PSI), I'm sure you will probably find it to be low, since you have a starting problem. ICP pressure needs to be around 500 PSI for the engine to start. If you can get it to start, look at IPR% it should be somewhere around 30%, if its much higher then it's compensating for a oil leak, especially if you see 85%
Ok, if you read all of that, the only thing I was going to add is checking if you are actually pumping oil. all of this is covered in a video I found. Actually skip what I wrote above and start with this video first since you had injector and oil cooler work done recently. haha.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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