I had to make my own t-adapter to splice into the upper radiator hose. I tried the T fitting on the manifold but that changed the reading on the OE temp sensor because it was now outside the manifold and thus reading cooler. I had a scanguage II hooked up when I did this, wasnt just relying on the needle, btw. Once I put it back in its place, temp readings were back to normal.
I just had a shop cut a peice of exhaust pipe and weld a bung on it so I could screw the temp sensor in. I wouldve gone with a pre-made adapter but all of them are for either 1/8 or 3/8" NPT thread....Im running 1/2" from Index Sensors & Controls, Inc.
. I think its a 210 on, 195 off. Ive posted lots of pics of my setup and i think i even posted my wiring diagram, look it up. Im running a 2-speed fan so youd only need half of the stuff on it. PM me if you have any questions