Thanks for your great reply. In assuming the Intex gauge is the same as all their other products (as you suggested) proprietary, I was finally able to find on their site and order one. Getting it in maybe two weeks. Due to how slow they ship and their COVID statement.
In the meantime, I noticed the original had teflon tape that was mostly gone. By providence I only knew of teflon tape because I just ordered a shower filter that included it. Since my boyfriend installed that without the tape and it’s working fine, I’ve wrapped my gauge with it. I also superglued around the lens. Will install in the am to see how this works out as a temp measure.
As a very non-mechanical female your suggestion showed I’m possibly on the right track. And YouTube vids sure help.