The pressure switch is so the burner goes off when you stop squeezing the gun, there are only 3 different combinations wire1 and wire 2, wire 1 and wire 3, wire 2 and wire 3, it does not matter which way you connect them. You will know when it is correct as the burner will only work when the gun is squeezed and water is coming out of the lance nozzle at high pressure.
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The pressure switch is so the burner goes off when you stop squeezing the gun, there are only 3 different combinations wire1 and wire 2, wire 1 and wire 3, wire 2 and wire 3, it does not matter which way you connect them. You will know when it is correct as the burner will only work when the gun is squeezed and water is coming out of the lance nozzle at high pressure.