Two photos of the vice grip I used (for any of you who are unsure what a vice grip looks like). I would suggest using a vice grip close to the size of the one in the above photo. As you can see, this one is about 7.25 inches long.
I also suggest that you secure the opposite side of the side you just secured. Is that confusing? I will try again. Look at the photo below (not my intercooler and not my feet):
As you can see, there are two longer sides and two shorter sides. Never mind that metal strap. Lets say you just secured all the teeth on the long side that the end tank hole is closest to. I suggest you then secure the opposite side (that is, the other long side that is closest to the guy's feet). Do the same with the shorter sides. After you think you secured all of the teeth down, go back and check every single one of the teeth. Every single one of them. Make sure they are not "sort of touching" the end tank, but that they are being useful. After you have finished completely securing one end tank, start on the other end tank.