While donning the positive-pressure self-contained breathing apparatus, you discover that the air cylinder pressure gage and the regulator pressure gage differ from each other by 500 psi. Which of the listed action should you consider as appropriate?

Correct Answer: Option D — Assume that the lower gage reading is correct.

When self-contained breathing apparatus pressure gauges show a discrepancy exceeding allowable tolerances, safety protocol dictates assuming the lower reading represents actual cylinder pressure to prevent unexpected air exhaustion in hazardous environments.