For the price of a digital gauge I might as well go straight and buy a new reg . I'm not to impressed with the back up service from daystate / Brocock all I ever here about is how strict their quality control is and like I said the gun has been back to them twice. According to sub12airgun YouTube he said that the process for servicing the reg on the ghost was the same on the delta and alpha wolf but is it the same regulator and is the HP the same as the standard FAC reg