Yeah, it should be the same thing that was tapped to connect the oil feed line.

I am assuming the vacuum you are talking about is for the boost guage:

As for getting the wires and such through the firewall, there is a rubber grommet with wires coming out of it right underneath the master cylinder that works quite well. Take the wires that you need to get through the firewall and tape them to a long screwdriver and punch them through the middle of the grommet from the outside. The tip of the screwdriver should be poking out underneath the fuse box by your clutch pedal. Then pull them through and connect them to your guages.