Yes, I used the same welder. I use a footpedal to operate the machine, so not sure what amperage I am actually using.
I also played around with some strengthening ribs in the sides of the tank, as per the originals. I found a good way to do it, but the panels would always warp a bit and I decided not to use them in the end. It does look a little bit less like the original tanks, but they don't need the ribs for strength. I also planned to put baffles inside, but that was a pain to weld, so didn't use those.