I have 2 25 gallon tanks and filled the port with 15 gallons and the command link says that I am on 1 bar and that it is also flashing. Is 15 gallons not enough to make a mark in the 25 gallon tank or does command link take in consideration the total amount of 50 gallons and works in that way, meaning if I fill one tank full and the other tank is empty the gauge would read 1/2 full.

Hope that makes sense.