I just installed the same housing and I am getting about the same pressure. But there was a lot of water flowing out the tail pipes and the engine was running cool on the trailer. We took it out to the lake and at about 50mph I was getting about 8psi,and at 100mph I was getting 25-30 psi, and the engine was always running cool no matter if idling or at any speed. Very Happy with the housing.

Before I installed the pump, I added an 1/8 NPT port on the pressure side of the housing so I could monitor the highest pressure seen in the system.

I would of installed a multiple stage pump, but I did not have time to do the change. Not so sure I would of really needed the extra stage now as the extra stage was going to dedicated to the intercooler.

funny you mention that. first gauge i had was no good. it would not move off 0. so i sent it in and they sent me a new one. have to thank them for that. autometer pro comp marine. i got about 6 psi at 50 mph. cant seem to get to 100 mph or 70 mph. best i can do is 65. been to 80 on the trailer but thats wind preesure not water pressure

Where are you taking the pressure reading from?????

Your pressure reading is very low especially for 3000rpms and up. 0-2psi at idle is pretty common. I still have to wonder if the gauge is correct.