I just installed my pricol fuel guage and when first start truck cold guage go's to about 7.5lbs pressure and stays there for about five minutes or so then drops to about 0lbs pressure?
Does this mean fuel pump is on its way out! Does not seem to effect truck though? I have FASS and plan to install any day.
Just curious whats up with stock pump!

 

I don't think you have anything wrong with the pump. mine did that also and it turned out that the diaphagm in the isolater was maxed out to the gauge side. I rebled the gauge and it hasn't done it since. make sure to either disconnect the fuel side or just loosen the bleed screw while you are putting fluid in the gauge side.