What pressure indicates that the red gear oil is disabled when engaged?

The pressure that indicates the red gear oil is disabled when engaged is related to the operational parameters of the gear system. Specifically, if the pressure drops below a certain threshold, it suggests that the lubrication system is not functioning properly, potentially leading to gear damage.

The correct answer reflects that if the pressure is less than 196 PSI, it indicates the red gear oil is not effectively lubricating the gears when engaged. This low pressure could cause improper lubrication and overheating, which could compromise the integrity and functioning of the gear system. Hence, maintaining pressure above 196 PSI is crucial for ensuring that the red gear oil is operational and providing the necessary protection for the gears.

The other options indicate pressures that either suggest the system is still operational or are just above the threshold for concern, thus reinforcing that a pressure of less than 196 PSI is the key indicator of a potential problem.