The picture shows which lines go where based on the alignment pin on the switch. Shifting out of four wheel drive the valve moves down, it blocks off the vacuum feed first, then opens the actuator port to the vent line, That lets air into the actuator and it moves and unlocks the front axle. Shifting into four wheel drive the valve moves and sends vacuum to the actuator, it also blocks the vent port so there is no vacuum applied to the T-Case seals. The actuator port and vent are connected so it cannot move on it's own and the case vent functions. In two wheel drive, the incoming vacuum is blocked front axle actuator is disengaged. Now you should find one port of the two left has vacuum. Start the engine and shift the case into four wheel drive. This is the port that goes to the engine vacuum. Move the line until you find the port you cannot blow through. Connect a chunk of vacuum line to any port and blow into it. To determine which is what when you cannot see the switch. Two lines are vacuum, the third is connected with the T-case vent.
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