I do controls, but I have been watching and learning the refrigeration side. Plus I have studied the digital gauge issues and watched the videos online. Here is my question. I have never seen the guys I work around charge to a temperature, just pressure. I have watched them on small pack units, large pack units, condensers, chillers, you name it. Some have over 20 years in the business. I am curious as to the pros around here's take on that.