Final answer:
No. In the field of Engineering, pressure gauges and regulators do not require oiling because they are sealed units designed for smooth operation without contamination.
Step-by-step explanation:
The question "Are there any internal or external moving parts on a regulator or a gauge that require oiling?" pertains to the maintenance of devices used to measure or control the pressure in a system, which falls under the subject of Engineering. The correct answer is No; in general, pressure gauges and regulators do not require oiling because they are designed to be sealed units to maintain accuracy and prevent contamination. The design of these instruments typically includes tight tolerances to ensure that any moving parts operate smoothly without the need for additional lubrication.