Ok.. on the MAP issue. Here goes. There is a long length of green wire included with the kit. You need to splice into the green wire on the MAP sensor to get signal from it. And then run the wire to the PAC controller. Typically I cut the insulation, peel it back, wrap the supplied green wire included with the kit.. and solder it. Then wrap the connection with electrical tape. It is your option to splice into the green wire under the hood or behind the dash. But this connection is important as this is how the PAC controller sees how much boost your at. The 3 bar MAP controls when the alky comes on.. and how it ramps up in pressure.
The minioverflow can be installed anywhere. It is personal options. You can mount it drivers side, under a fender, under the core support, etc. You dont put liquid into it as its function is to catch any overflow. Tracks require an overflow. Some even use their windshield tank as the overflow and not use the supplied mini.
HTH