I have never used a blade tension gauge. Based on all articles I've read over the years, both for and against, I could never see that using a gauge would yield better results than just assessing the tension by pushing with your finger to determine the blade's deflection. In additon, I've seen Alex Snodgrass demonstration blade installation and bandsaw tuneup at a number of woodworking shows and on YouTube. Based on his method, which is using his finger to deflect the blade, I can't see the value of a blade tensioning gauge. If you don't feel the blade has enough tension based on your resawing results, just gradually put more tension on until you feel it gives you the result you want (although I doubt that the tension is usually the cause of resawing problems). There is obviously a limit to how much tension you can put on a blade, but I think that blade breakage from too much tension is rare. At least it's never happened to me.