Each pressure gage used in an oil transfer operation must be accurate to within what percent?

Correct Answer: Option D — 10%

33 CFR 154.525 and 155.785 require that pressure gauges used in oil transfer operations be accurate to within 10 percent of the maximum pressure rating. This tolerance ensures that the PIC can reliably monitor system pressures and detect potential over-pressurization or leaks during the transfer process.