You definitely need the regulators on tanks to control the amount of gas and oxygen that goes to the torch! You will also want flashback arrestors (also called check valves) to prevent back flow. I don't know anything about that brand of regulator but if it doesn't hold the pressure steady go to your local welding shop or a glass shop (there are good ones on line listed on this site) and get assistance. Regulators are important. There is lots of information available here in the archives too. Good luck and welcome to the addiction!
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Polly
"Confidence, like art, never comes from having all the answers; it comes from being open to all the questions."
-Earl Gray Stevens-
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