Look under
From under the truck is the easiest for me to find the dowell pin. It is under the P-Pump. You have to push your hand up between the injection pump and the block. Get a light and look up from under the truck, it is black plastic and a pain in the hiney to reach , but it is there. Remember if you push it in to pull it back out, it would be nasty if you broke something inside, because you forgot to pull the pin back out !