You will always have different pressures throughout the entire system. The gauge will see the highest pressure because only #5 is being fed oil (if I'm not mistaken) before the all clearances start slowly bleeding that pressure. If you were to take a reading at the drivers rocker shaft it will be less than gauge pressure.
Which makes me ask a question for the original oil tube mod. Since the oil is flowing so fast past #4 and the tube mod slows this force down, why not just run an oil cooler out of the oil pressure sensor port that would bleed this excess flow and dump it straight into the pan or drill a hole adjacent to the feed line and dump it next to the distributor drive. This would accomplish the exact same thing and slow down oil at #4 as well as cool the oil.
