Everlast 62i - torch moving before cutting voltage sensed

I’m trying to find examples of aftercooler’s installed post tank, so far this is the only one I found and it’s made from copper pipe. Aftercooler placement - I don’t have a clue on how to sweat copper, so that option is likely out. Have folks bought an aftercooler like this: Amazon.com and then installed it post tank (like on a wall), then run it to a water trap and then on to the rest of the system?

It also seems like an easier option for someone who had never even run an air compressor before he bought his langmuir (me)?