By dead heading, I assume you mean the gauge is hooked in the end of the hose and hose is disconnected from the steering motor and that would be a good test. However, it is very hard to determine which one is problem except that if relief valve was leaking badly you would have low pressure to gauge even when dead heading one of the aux valves. I remembered how to get that relief valve out to check it, you need to take the spring and spool out of flow divider and go from underneath and screw it out. I would also be doing some other type of testing if me. I would hook a hose to pressure port to steering outlet, put a gauge in hose , then restrictor valve, run hose back to reservoir, close restrictor part way, and build some pressure, maybe couple hundred psi, pull hose out and time a flow into a container. Should get about three gallons per minute. Quart in 5 seconds. You have to make sure the gauge you have installed on there now is reading dead headed, blocked flow and not rely on turning steering wheel to block the flow as even a good unit will leak considerable oil through it and a worn or misadjusted gear end play in the unit will leak a lot through. If you can see wear on that spool of the flow divider it won't work, period. I have replaced many over the years after they made them a service item. Originally they were not.
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