The shrader valve is 1/16 NPT but standard fuel gauges are 1/8 so you will need an adapter, I had mine custom made so it may be hard to find. I think places like steeda sells them.
The dropping of fuel pressure when the engine is turned off is normal, however the speed it all going to depend on several factors including what modifications you have made and hot hot your vehicle is, I think on hot days it takes several minutes to drop all the way down, but it slowly starts dropping after the engine (fuel pump) it turned off.
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