Quote Originally Posted by neuron View Post
...Would I be better off using AS5 or using the stuff that's already there, just making sure it's got proper contact?
No, you don't want to reuse the pad (the thing that's already there) nor do you want to use AS5 because of it's conductive nature.
I can't speak on the stuff that came with your TRUE 120, but you'll want to get a tube of non-conductive TIM.