lift pump safe psi

DGT

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Just installed a mec fuel gauge today reads 7 psi at idle and 6 to 7 psi on hwy goes to 5 1/2 psi if I romp on it. Is this good or weak for
03 dodge cummins 1 ton all stock. I heard below 5 psi is to low
reading between injector and filter on supply line to injector.

50% wmo 50% diesel 90 deg outside temp
 

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