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Your guage is probably off a bit. I have a guage like that which is about 200 psi off as well. My other guages and a tank checker guage are all consistent with each other with the exception of this one USD guage. It shows 200 psi less than what is in the tank so it is a bit conservative. I have no problem using it as I am aware of how it reads. I would toss it if it said I had 200 psi more than what I actually had.
I would check your guage against others and see how it calibrates. I am not aware of any repair that can be made to your SPG so if it troubles you get a new one. I don't see a safety issue in diving it as it gives you a reserve, so to speak.
There is no deliberate error built into the guage by the manufacturer but sometimes guages don't calibrate accurately. Looks like you and I got stuck with one of them.
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