(1) Pick a starting valve - call it # 1- click it once.
(2) Work clockwise and call the next valve # 2 and click it 2 times.
(3) Continue clockwise and call the next valve # 3 and click it 3 times.
(4) Continue clockwise in this manner and you will be clicking the 10th valve 10 times.
NOTE: If it were not for the fact that one valve has double pressure it could not total higher than 55.
The meter to the side will show the total that your clicks have amassed will indicate the double pressure valve when you subtract 55 from it.
Let's say your total pressure is indicated by..... (5 outer indications meaning 5 X 12 = 60 and your inner pressure indicator of 1 X 1 = 1 making a total of 60 plus 1 = 61. Therefore, 61 - 55 = 6 and the 6 tells you valve # 6 is the one with double pressure)