[Richard L]

The initial test is for brief visual confirmation of the system is working as designed. For more a refined calibration of the gauge and failsafe window, you have to do it in driving conditions.

The sensor calibration jumper link is designed to verify the bar graph is working correctly and the connection to the gauge is sound. It has nothing to do with the actual flow. You can also use this link to view where the failsafe window is set. "B" led activation denotes the flow is inside the failsafe window. Remove the link after test.