Thanks. It's alot cheaper that $40+ shipping plus waiting a week for the part to appear.
I just went outside and looked at the 6.9 sitting in the back of a van. I saw a pipe plug in each head towards the rear of the engine, and between the valve cover and ex. manifold. I also saw a pipe plug in the top of the water pump but that location could be too restrictive.
Agnem if in fact you need to install a thermo switch for your fans those would be better locations for the switch. If they are in use, (turbo, tank heating system) then you could tee in.
Man, I always type like crap then catch my mistakes later