See Universal Installation Guide for Installation on Turbo Down Pipe
1. Remove turbo from exhaust manifold.
2. Stuff a small shop towel or rag 4 to 5 inches into the rear exhaust manifold passage (see pic below) through the turbocharger mounting flange. This is to prevent chips from entering the manifold while drilling and tapping.
3. Drill through the exhaust manifold into the rear manifold passage. Use a 7/16″ drill bit and keep the drill perpendicular to the manifold surface.
4. Tap the drilled hole with a 1/4″ NPT pipe tap. Check the thread depth as you tap by periodically removing the tap and screwing the probe fitting into the tapped hole. The probe should thread 3 to 3 1/2 turns hand tight. Do not install the probe in place at this time.
5. MAKE SURE THE RAG IS REMOVED FROM THE EXHAUST MANIFOLD. Also remove as many loose chips as possible left in the exhaust manifold. A shop vacuum or small brush may help.
6. Install the probe in the manifold. (Anti-seize on the threads is recommended)
7. Continue to hook up the pyrometer per instructions in the universal install.
[thanks to DIS dieselpage.com used with permission]