Ok, I've popped the little freeze plugs out of the ends -> very, very easy to do. It's sized perfectly inside to be tapped NPT.

So I will come off the right side with a 1/4 npt line and break will T into two 1/8" barbed fittings, the other end will be a barbed fitting directly in the end. This rail is large inside and connected to all 4 runners, I can't foresee any issues sharing it this way. Last year my AFPR/MAP/boost gauge all shared one vacuum hose with no ill effects that I could see, it has to be an improvement over this.

I'm not going to throw tons of effort into this. When my 6 bolt block is completed, I have a fresh rebuilt 1g head to go along with it and will most likely run either a Magnus cast intake or some other SMIM.