[ppbon]

.... my particular gauges are electrically operated.
The sensor sends a signal to the gauge which has a servo motor so it reacts to every change of pressure quickly and accurately.
Many analog gauges are. Very slow to react do it seems that the pressure is steady when it's actually not.
Again, there is nothing wrong with my gauges.
What you may see as a pressure drop under braking is just the normal pressure drop from decelerating the engine's RPMs.
On the track the oil temp is much higher than normal and therefore less viscous do it also allows for a quicker drop in pressure than you'd normally see.
The video may not look it but almost every turn generates close to 1G lateral.
Happy Boxstering
Pedro