Jim,
That fitting at the block is a POS. The nylon hose on my SPF was some weird size, so I couldn't find the correct compression fitting at any parts store (you can probably buy it through Superformance).
Based on a recommendation from a fellow owner, I went with an AN line set up. Here's a link to all the parts you'll need and a link to the company that I bought it from.
Best way to access back of oil pressure gauge
You can mess around with it, but I'm betting it's going to leak again.