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 actions should you consider as appropriate?

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

When SCBA gauges provide conflicting readings, the conservative safety protocol is to assume the lower pressure reading is accurate. This ensures the user does not overestimate their remaining air supply, providing a necessary safety margin to exit the hazardous environment before the air cylinder is completely exhausted.