IF you can A. get the high pressure gauge out of one and B. the tank connector off the other and C. find a left-handed nipple of the right length, this works. When I tried it, all I was able to do is C. Couldn't budge A or B.
Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
"I would like to die on Mars, just not on impact." Elon Musk