That is fine. Good rule of thumb is at least 10 psi for every 1000 RPM. So at idle you should have at least 10 psi, though I'm more comfortable with 20+ at idle, and 30 psi at 3000, 40 at 4000, etc... 75 psi is typical relief valve pressure on the pump so when you're at 70-75 your pump is likely bypassing to bleed off the extre pressure. Sounds like you have a healthy and tight engine, no worries.
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