I wonder of you could ditch the brass fitting on the boost guage and use something like what's on the factory emissions hard lines. Something like:Haha good cause that’s the one I bought. I also bought some additional barbs to expand the distribution block so I can run dedicated lines the FMu and boost gauge (and future bypass valve) instead of using tees.
https://www.summitracing.com/parts/...rnN9lBrTRs8ihROG6nEvCwKTWq7wM0GBoCPMUQAvD_BwE
just a generic link, not sure what size you'd actually need. A little 3m weatherstrip adhesive on the tube might be needed to glue it in, or something similar.
I did that to fix one of my emissions lines when I had them on the car. It broke right where the hard lines goes into the rubber end. I shoved the hard line completely through the rubber end. Then warmed it up a little with a hair dryer and pushed an awl in the hard line a little to flare it. Then when it cooled off I put some 3m adhesive on it and pulled it back through the rubber. The flange I made pulled tight into the rubber. Worked good.
Just a thought if you have more issues with the compression connector.

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