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I had this problem and found a boxed end wrench to turn it until the leak stopped - using a soap and water test.
That 'stem' the gauge is mounted to is a float. The gauge is magnetic and reads an internal float arm. As you turn the arm, the float becomes less accurate. The turning also widens the tapered fitting, making it likely any replacement will have to be turned to the same degree to stop a leak; making it inaccurate.
I spent the money on a new float and it sits in a box, because installing it would likely make it equally unreliable as the one that's in there. A new tank, outfitted with the parts, is $400. If you're lucky and it fills without leaking, it's your best shot at a reliable fix. You may be able to use pipe dope (a special kind) but the tank has to be empty to fix it, filled and tested - rinse and repeat - until you have what you want.
Sorry for the bad news. Not intentional. Just been there, done that.
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