oil pressure line and vacuum line placement

['65 chevy lover]

Trying to install the oil pressure line and not sure if this is where it goes. Below is a picture of the top of the motor and there is an Allen wrench sticking out of where I think is where it goes. I have a brass plug that came with the kit of three gauges(oil pressure, water temp and amp gauge. I had instructions that came with all this stuff at one time but have lost them. If this is where it goes, how far does the tube need to go down into the fitting? I also have a question about vacuum line needed for power brakes. There is a Y fitting coming from the carb that goes to the distributor and to a valve cover but, these are the only places I see a vacuum line. If I come off from there, will the vacuum be strong enough to operate the brakes? I appreciate any help given with this. I'm just about ready to start this thing up, just got few more little things to wrap up.
Thanks,
Bill