By the nature of working with compressed gasses the gage dousent really tell you much. It is not like the fuel gage in s vehicles. It will pretty much tell you that you are running out when you are just about out.
Non the less there is nothing bad about having on.
You can judge your fuel level in the tank while you are using it by feeling the side. There will be a buffenent line where it is colder. On a cold morning you will even see a frost line where the fuel level is at.
Weighing is also a pretty good way to judge how much fuel is left in it. When it is empty note the weight. Then fill it and see what it weighs. Then again after a normal use or weekend trip. After a while you'll get a feel for where it is at buy just picking it up.
The little 5Lds bottles are great. Post some pictures of them in use and maybe your transportation solutions.