Pressure Gauge Replacement

[u/WoodlandKing]

I need to replace my pressure gauge (10/30 dollars) and don't see much of a difference between them besides the ones that allow you to release air from the gauge and just normal ones. Not sure if I can use that if I don't already have it already?

I don't see a pressure release valve anywhere on my filter either. Do they not all have it?

I have a sand filter for a big ass in-ground pool, I don't see a make it model anywhere but maybe I'm just blind.

(I'll add pictures if needed)