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Hello, I'm Chris. Thanks for seeking us for help.
You would need to remove the high pressure oil line to one head, plug it off. Crank the engine and see if the ICP pressure will spike up over 500psi while cranking. If it does not, then the head still connected correct is the one that is leaking the high pressure oil down.
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The vehicle still starts but is reading 0psi when I dead head the drivers side. Trying my best to narrow down the bad Injectors.
Being your blocking off all high pressure oil to the drivers side and the reading is still low pressure. That means the passenger side has your leak.