Originally Posted by AFChap
...the gauge is the FIRST thing to freeze in cold weather ...learned that the hard way...
If the gauge is the first thing to freeze (I'll take your word for it - I don't leave mine attached), the diaphragm inside the regulator must be the second thing to freeze. I learned that the hard way, too. There were no signs of damage on the outside, just full line pressure the next time I attached the gauge.