So, the KDP or "Killer Dowel Pin" is a small steel locating pin used to align the timing gear housing to the engine block. The problem is, on all but the latest 5.9L Cummins, the pin is just sitting in the timing gear cover and block, not held in by anything other than friction. It has been known to work loose in time, eventually falling into the timing gears and wreaking havoc, sometime resulting in catastrophic engine failure.
A common fix is to buy a tab kit which gives you a steel tab that fits under an adjacent bolt, and caps the pin off so that it cannot come loose. Looking at some pics of the part, I couldn't see how it was going to fit on my truck, it seems the slightly later trucks don't have a big shoulder around the pin like my truck has. There was no way a flat tab was going to work.
So I just tapped my pin in, and used JB weld to secure it in place. I also drilled a hole through the aluminum flange around the pin, and forced the epoxy through there to make sure it was unable to back out itself.
I'm doing this as part of a bigger project I'm working on, as a "while I'm in here" type of thing. So if you're just doing the KDP fix it will be different, but anyway here are some relevant pics and explanations: