My humble advice is to use the tool like it was designed to be used. If you want to reach higher temps/pressure then you need an sterlizer. https://www.amazon.c...rial,257&sr=1-3
The unit you linked to is a canner, and its weighted gage will vent at 5, 10, or 15psi. It was not designed to run at higher temps/pressure.
The jiggling of that weighted gage at 15psi will let you run your canner from the other room with no problem. Even the hard of hearing, like myself, can hear the weight jiggling when it vents steam.
Again, I would advise not modifying the way your canner works. AA is the cadillac of canners, and it will do the job you want it to. Just relax and take the time that you need to take, to do the job you need to do.