What type of oil pressure gauge is it? Mechanical? Or electric...

If its mechanical it needs a line run to an oil pressure source...and if its electric it needs to be hooked up to an oil pressure sender (don't know if you can use the factory signal, but if you can I'd just tap into the wire behind the gauge cluster...) I doubt the factory sender is that accurate though, its more of an "oh shit the gauge is pegged at the bottom" warning than an accurate measurement from what I understand..

The boost gauge is most likely mechanical as well... so you need to run that clear vacuum hose to a boost source, ie charge pipe/intake mani nipple.