I converted my Challenger from 5/16 to 3/8. Getting the sender out and back in is not too difficult, even with the tank installed. I put the car in the air, remove the right rear wheel and sending unit is accessible right there. Knock the retaining ring loose and work it out the hole. Now, that doesn't mean I'm looking forward to messing with it, but at least I don't have to drop the tank. But this is the stock tank and stock style sending unit for a carbed application.