On mine, I loosen the gauges and lay them forward. When lifting the tank, slide a finger or two under the chrome tang and lift it up firmly more or less pressing it up and back towards the tank. This will allow for sufficient clearance to work the tank up without having to remove the rear bolt.
I figured this out after lowering the tank after another install and the chrome tang was pushed up by the gauge mount and it slipped on by. Reversing this situation allowed me to lift the tank.