Sweetspot varies depending on the individual marker.
I don't know what mine are set at, the MQ2'd markers work and the trilogy pump is sweetspotted. None of them have gauges, because I don't care
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With stock springs, sweetspot on a WGP factory marker is usually anywhere between 250-350 PSI, with a spring kit you can take it to 250-300 and still get good efficiency with the stock valve, if you want any lower with good efficiency, you'll need an AKA tornado valve.
Other markers are forced LP like my system-X vengeance 4.0 'cocker, sweetspotted with factory system-X springs at 200 PSI but was a gas hog, changed them for AKA springs and it sweetspots at 270'ish with decent efficiency.
300 PSI is good with the stock valve, it'll give you good efficiency and if it's tuned right it should also be a quiet shot.