I just bought a peninsular intake and I'm wondering what sizes need to be drilled and tapped for whatever it is that goes on it. I was looking at dave12 garage and it looks to be an oil pressure gauge, a hose for some map sensor, and something else. any help would be appreciated.

Oil pressure gauge? In an intake manifold? You're probably talking about the line for a boost gauge. The stock upper intake contains MAP and IAT sensors. You'll need to provide for those one way or another. Use your stock sensors and/or hardware you plan to use to figure out what taps you need.