Hi Tom!
Seems like you already answered your own question but, I would strongly suggest that if you're going to be using this Synchro at both the low end, and at high amperages then, get a 200 air cooled amp torch for the low end, and a 400 amp water cooled torch for the high currents... All you would have to configure is a quick disconnect for the 200 amp torch in order to enable you to "quickly" change to the 400 amp torch, and a "Y" valve for your gas solenoid... If unsure of how to go about configuring the quick disconnect, and where to purchase the "Y" valves, contact your local welding supply distributor/store they'll steer you in the right direction if you pay attention as to what's available, and what's unecessary!!!
Always overrate if you can without sacrificing dexterity!!!
Tom, You mean to say that there are'nt any welding supply stores near your vicinity??? I ask this because, there are quite a few brands out there that will work with your Synchro so, do'nt get too cozy with the diamondback just yet!!! Check out what's out there so that you do'nt regret it later!!! This is the place you go to seeif you like what you're going to be using!!! Do you buy a car without test driving it first???
Go out there, and check them out!!!
Good luck, and all the best!!!
Respectfully,
SSBN727 Run Silent... Run Deep!!!