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AirDog 150 Making 20psi

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So I just got my gauges switch over from my 01 truck to the 02 truck both are 3500, I need to change all my truck info those two trucks are gone in my sig. But anyhow I have a snubber and a needle valve in the 1/2 in fuel line going to the vp44. Well when I first fired it up fuel pressure was 20psi and it stayed there for 30 seconds or so and went down to 17.50 and pretty much stays in that area. I took the truck down the road for 2 miles and back and on my way back it climbs to 20-21 psi and has stayed there, shut it off fired it back up and still 20psi. I removed the spring airdog150 pump came with and put the 17psi spring in. Im wondering is spring in a bind or is my gauge acting up, fuel gauge is a pricol and its probably a 10 year old gauge. And is 20 psi ok to run at?

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