I was looking for a pressure gauge lately and remember seeing Wika.com has a web store where you can buy the analog “airgun type” pressure gauges, but they seemed pricey.
I have never seen them on that Wika US site. Check out link below. I ordered before and got one NO problem. $40. Ships from Overseas, so will take a minute, but you’ll get it.
I broke down and ordered from Palm Beach airguns. This was after I called the Wika store (in Georgia, I believe) and was informed that they did not stock any pressure gauges that small.