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Yup. Entirely possible for any given gauge to consistently read +/- 250 psi. Seen several threads about this.
Chances are, one gauge or the other is off by a good amount. Some manufacturers may let you replace it, others will tell you it's within the margin of error. (if you think of 4000 psi as the top end, a 5% margin of error means +/- 200 psi.)
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