I need some assistance installing the clamp-on style EGT probe (clamp not in picture) pictured below. Has anyone else installed this Autometer probe? The website directions are not quite clear. I would like to install it pre-turbo, preferably in the manifold. Reason being is that I can then later tap and plug the hole if needed. Or do I have to put it on the up pipe? Secondly, where should the collar rest? It appears to fit snugly as in the picture but that would mean the 90* bend is inside the manifold. As well, do I need to use a ceramic washer? Any help is appreciated.