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One line from the oil reservoir tank off the turbo, one from the standard breather line/pcv valve, one back to the intake system. If you don't have a breather tank, or just a two port (in/out) style, you will need to plumb the breather line from the reservoir back into the standard breather line system via a supplied t piece and line.
To answer a separate question, there's no point in running a "lower" boost system at any time to get better gas mileage. The best system for getting better gas mileage is to simply keep your foot out of the gas. Turbo's don't automatically boost as you get into the higher rpm's, they do that in direct response to the amount of throttle input vs. rpm. You can rev it all the way to 7k at partial throttle and not break into positive manifold pressure. Due to that fact, turbocharged variants of n/a motors often get slightly better gas mileage on the freeway than stock.
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