I can't answer your question, but you should be able to add the hydraulic pressure switch on to the drill if it wasn't standard equipment on that particular model. It's not on all models. It was standard on the one I used, but I could not get it to turn the hydraulic driven meters on and off on that particular tank through the Topcon 30 using the setup criteria in the manual. I'm sure it can be done, but the local support came up short on delivering the feature on time.
It's a very annoying feature to be missing when you're accustomed to it. Thankfully there weren't any mile and a half long misses, from daydreaming. Sectional control should handle that this spring, but I still insist the other feature needs to work for the parts of the job where sectional control will need to be disabled.