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Momentary fuel pressure drop?

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Meat

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In my 1966 Cherokee 140, when I turn off the electric fuel pump, the fuel pressure as measured by the gage drops to zero for a few seconds, then rises back to 5 psi. I have seen this a couple times in the air during cruise and I was able to reproduce it on the ground during a run-up. The engine never hesitates and continues to run just fine on the mechanical pump. I am fairly new to the plane and never noticed this before, probably because I had other things on my mind and wasn't looking at the fuel pressure gage. Is this normal?
 

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