Mix n match Oxy/acetylene gauges

By mix n match, do you mean like brands  /type?  If so, yes.  Personally, I would never put any used regulator on my oxygen tank, that's asking for trouble if you don't know what all it's been through.

Yeah, I mean, as long as the fittings fit up, and the regulator does what you need, I don't know why there would be an issue.  If you don't need "top shelf", and I don't know why you would, I'd think you'd be fine.  I only meant, if you go cheap, I wouldn't go cheap by going used.  

Torch dosent care what brand regulators you attach it to. Get both while your at it and don't use it till you put backflow preventers on it. You've probably been using for years but one backfire with a little low pressure and you'll be paying in pain. A complete harbor freight set won't be much more than regulator and backflow preventers and you'll have new hoses too.

When I closed the shop where I was manager , I saved around 20 regulators and flow meters , many were Nitrogen regulators and some other gas types , most were 2 stage so the drift ad pressure in tank dropped the work pressure did not change dramatically . 
  So my 4 sets of Oxy / Acc torches are equipped with all different brands or regulators as well as torch barrels - From Victor , Wards , Harbor Freight , Harris , Smith , and as one gives trouble , the hoard of used regulators gets raided . 
  Found the diaphragms' in most will hold up to many different gas types , as will the flow controls used on my wire feed units . Acetylene regulators work on MAPP as well as Propane , Nitrogen regulators will control Oxygen with the change of the input pipe , 
Have a few converter fittings where one type of regulator can be easily hooked to a different output tank . Seems from using 3 different types of gas , now have 5 or 6 different ones that I myself use or son does in his side of shop.   

Regulator brand will make no difference. Use regulator for the product it's designed for; ie., an oxygen regulator on oxygen, acetylene on acetylene. 

As someone mentioned, I can buy the whole HF set for the price of a regulator.
Would this set come with built in flashback protectors?
I’ve been reading reviews and think I’ll buy the heavy duty Victor type.

Thad in AR. wrote: HudCo wrote: just make sure that if you use any kind of pipedope or teflon tape that it is oxegen rated , i have seen some pretty mean oxgen explosions have from things done wrong  when doing some pipe fitting and welding out at the steel mill several years ago Where would I find the proper thread sealant? Thanks .

Ray54 wrote: Come guys come out and say it. NEVER EVER NEVER use oil used as lubricante on treads around pure oxygen. There use to be safety posters with that in most welding supply store here. Not so much anymore. Just because all of you know that............................you just never know what kind of freebe guys might stumble onto this. Let them earn their Darwin award without our help.

Neighbor's friend decided a oxygen cylinder and regulator would make a good portable air supply for spray painting his motorcycle tank a new color . Worked great for a few minutes UNTIL full system reacted , he lost a eye and part of his shop along with gas tank and rest of his painting supplies . ( Sometimes the good intention and well planned shortcut don't work out )