I am a big fan of the Winters P9S series gauges. I have replaced all of my gauges with them. I also have a Wika 4 inch test gauge that is accurate to .25% that I use to rezero the P9S gauges.
There are two reasons I like the Winters P9S, the first is the accuracy rating of 2/1/2, which means that in the middle of the range, it is accurate to 1% of the reading. The second is that you can rezero it (hence why I have a test gauge), which I test about once a year, or if I suspect it might be off.
when I was checking my old gauges, some were off by about 1-2 psi at 15 psi, which doesn't seem like much, but percentage-wise, it is huge. I have these on my primary regulators, secondary regulators, spunding valves, etc. I have different ranges, but mostly 0-60 psi for primary, and 0-30 for secondary.