100acresranch.com is the website. He's active on TG and I think he's on X as well. He's been very responsive and helpful getting the tuner setup.

I removed the power supply and added a Loki board from Pivotal Pleb Tech (pivotalpleb.com) to the control board before installing it in the tuner box. Pivotal Pleb has a detailed guide on their site for installing the Loki, which can also be used to allow a single s19 hashboard to be powered from 120v AC.