i know this been covered 100 times but i Trying test my 7.3 hpop I have one hose off hooked on to a gauge. I got no reading when i am cranking other hose still going to head do i need to cap off other side or no. also ipr is plugged in but am I missing something

 

just did a check on hpop one side still going to other head other to guage with ball and spring removed got no pressure reading with ipr pluged in. do i need to cap off other side first or no

 

There is a Plug for the line not being tested (Quick Disconnect Fitting). However, if you're not seeing any pressure you have an issue. Have you looked at it with a Scantool (ICP) to determine if the gauge is possibly defective?