Locate the sprinkler head furthest from the sprinkler manifold box. This will likely be the sprinkler that shows signs of low water pressure, or it may not pop up fully.
Pull up the sprinkler head by hand to expose the nozzle.
Insert a screwdriver into the set screw in the top of the nozzle.
Turn the screw counterclockwise until the screw stops. This will open up the nozzle to its fullest flow capacity.
Locate the main water line where it enters your house.
Follow the line until you locate the water pressure regulator, which is metal and sits along the main line near where it enters the house.
Loosen the nut at the bottom of the regulator, using the adjustable wrench.
Turn the nipple at the top of the regulator, using the screwdriver to turn it clockwise until the needle on the attached dial reaches 70 psi. This will increase the amount of water pressure available to your entire home. Tighten the nut once the adjustment is complete.
Run the sprinklers to test the new pressure setting.