Long time between posts here too, this one also caught my attention. I do not use an auto helmut for TIG. I use shade 11 basic jackson helmut. It also depends on the amperage you are using that will be a factor in choosing a shade. I have a good Jackson auto helmut for MIG. I do not use the auto helmut for TIG cause sometimes the auto helmut would "false" on me. Here is a picture of new larger fuel pickups I made for my boat tanks. I made a pressure testing jig to pressurize them to 4 psi and check for leaks.
T.J.