Finally got around to removing a pneumatic shut off valve off of the back of the spare injection pump and took a picture "up in there" of what the shut off valve tab hooks into. Circled in the first picture is the area of the injection pump linkage that the tab from the shut off valve goes into. The tab goes in there from the drivers side toward the passenger side of the pump. When you initially insert the shut off valve and before you fasten it to the injection pump you should be able to pull back on it and feel it pulling on this lever if it is seated properly. Once you get this seated feel when you pull on it you can bolt it down. The fasteners holding it on take a 10 mm socket.

Not installing the shut off valve properly can result in a runaway engine.

__________________
Jim

This should look familiar to everyone. I have circled the tab that inserts into the linkage in the first shot.

__________________
Jim