Okay. Time for an update. After scratching my head about how to solve this problem. I came up with this.
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I ordered an aluminum manifold and a 24” stainless braided Teflon hose. Good to 450 F. It all came from McMaster-Carr. I bought a “one end swivel” hose. Little did I know it actually came with a stainless AN adapter. Some 1/8 plugs and a couple reducers and we are in business. I also traded the brass elbow in the engine block for a stainless version since I was ordering anyway. Here it is all installed.
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Feed line comes in the bottom. Top two holes are plugged.
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The good news is that I have pretty much the oil pressure I had at the first start back last year. The bad news is that I still think the sender is bad. As it started to warm up, gauge was back completely on the peg. Behaving just the way it did the other day. Ground the sender wire and the gauge pegs full. Luckily I bought a sender the other day. I’ll swap it and the factory one (it’s never worked).
But this is progress.