This will give you a good feel of what is going on with the gauges. Now remember the injection pump turns at 1/2 the rate of the crank but fires all 6 injectors in 1 360* turn of the gear. So let say your cruising at 2K RPM's so the injection pump is turning 1K RPM's but fires 6,000 times a minute. This is why you really don't see pressure change like my video but since the frequency of the valve open/close causes a buzzing noise to mechanical gauges. Also my irragation system is much higher pressure compared to liftp pumps but the same efect happens just on a smaller scale.I blown up the filter once already being dumb and slammed shut a ball valve. It absolutely exploded!
Here you go guys and gals a water hammer video...