I have hp500's that upon start up and idling to warm up have really nothing reading on the water pressure gauges, but if i goose the throttles alittle the water pressure goes up and then back to nothing at idle. They have water pumps and Bravo 1's with LWP. Under way everything reads fantastic until idle again then nothing on the water pressure. Is this a normal thing. The water temps stay great all the time. Thanks

Mine do the same thing on my 500hps as long as you have water out the exhaust at idle no worries.

Will have to try different launch ramp and back in just enough to see. Is a 35 fountain so hard to see under swim platform when backed in. I will try only backing in enough to see.

Idle = zero .....15-30 underway your good ....

yep

Completely normal to not see the water psi guage move at idle.

Thanks for all the imput. Was alittle worried but no so much now

X2. My 500's did the same thing, if you are getting water out the exhaust in decent volume at idle you are fine. You do not need pressure just volume, just check the flow out of the exhaust pipes at idle.