Be careful getting back into that truck, I think there is a little fox in the front seat.
I might have a connector with a little pigtail left on it around, wait yes I just looked in the box and I do. If you can post a photo of the connector you have on the axle, Ill see if this one works.
I would find 12 volts at the locker control box connector and the wire that goes to the pump and jumper them. The pump will shut off at 6 psi. I retrofitted all the stuff minus the box into my Gen I. I rigged up and LED and used the switch in the axle for the ground. The little thing lights up when locked and goes out when unlocked.
That box is a waste of time and I think most people bypass the lockout features.
Like I said, post a pic of the connector on the axle housing. If this is the right connector you can have it for the price of shipping. And Ill need your life history and phone number and address for customs forms of course.
John