Another head scratcher, fuel in gauge filter

[s1ngletracker]

So I have a prosport boost gauge, it has an electric sensor and a little inline filter. The original one actually split in half and my gauge stopped working last week. I think I might now know why. To replace it, I installed a little clear plastic fuel filter from O'reilly, and this morning I noticed that it was half full of gasoline!

I am tapping the vacuum line that goes to the fuel pressure solenoid from the intake manifold for the boost gauge. Is there some obvious reason I shouldn't be getting my boost source from there? I have no idea why so much fuel is getting into the filter. The problem is exacerbated by the fact that the filter sits horizontally. I'm thinking about securing it vertically so at least it doesn't stay full of gasoline and it drains out on its own.

The fuel pressure solenoid, as far as I understand it, can just limit the amount of vacuum that the FPR sees, in order to raise fuel pressure for certain startup situations, right?

Thanks for the help. Sorry about the book.