Dreampup leak

I just installed a reseal kit in my dreampup. I have a leak coming from the small hole just below the pressure gauge at the end of the tube. See pick. Is this due to the seal for the gauge? When I fill the gun as soon as it gets above 150bar it starts leaking until it gets back around 150bar than stops??? Anyone have any info on this issue? ThxView attachment 20220619_121130.jpg