Sorry. On the P-7100 there is a acorn looking nut down to the left below the governor spring plug nut. Unscrew that nut (expect oil to come out) and remove the small white plastic pin (note the position it came out) that is under the nut. Bar the engine over (helps to have 2 people) while using a mirror etc. to look into the hole that you removed the white pin from and look for a flat, thin metal blade to come into view. when you see it, stop barring, flip the pin over that you took out and re-insert it around the blade. pop the pump gear off the shaft and bar the engine over to TDC. Clean the hell out of the pump shaft and gear with brake or electronic parts cleaner, preferably a type that does not leave any residue and then tighten the pump shaft nut. 144 ft lbs is the recommended torque value for the pump nut. When you torque the nut, remove the pins (both) first, because if the engine moves a little while torquing it will shear the pins. Have someone hold a nut on the crank dampener or if you have a barring tool use it so the engine dosent move. This will put you pretty dam close to stock timing and get your truck running. Good luck let us know how you make out...
Jim