No that was not the only part I think I am going to need, just one that I have the least experience with buying.
surprisingly the air seat switch works.
off the 5 hubs my switch blade metric hex tool was strong enough to open the oil was clean, no burnt smell no water slime.
All fluids checked were full and used but not burnt smelling or exhibiting any condition of abnormal state, no water froth for instance.
the batteries on board started the truck repeatedly with 15 minute running to charge intervals.
The dash ignition switch has a bad spot if you turn it to far, full to the stops and it acts like a bad battery, back off a hair and it cranks right up - thanks to the people here I have a keyed on for it so when it is released to me I will replace it.
The ctis operated by observation I set it to full air pressure and observed tire conditions, the sidewall sag present before starting went away, when I set it down it returned I could here the system solenoids firing as it adjusted air pressure, I reset it to full load to air up the tires before I shut it off the last time.
I was unable to access the Transmission dip stick, I will try what
Elijah95 suggested when I go there next time.
I did not find an significant mechanical issues, wires at firewall were still good, engine ran as advertised system charged and air took no time to build up from 0.
I did find electrical issues. The 4-way flasher only works on front right, the left rear stop turn light does not work, the low beam on the left headlight is out. someone had wired the high beam switch closed so it did not dim lights, at the steering column I corrected that to test. I also found out my eBay purchased replacement head lamp also has no Dim power was present at the connector and it was in good shape.
The left rear stop turn lamp Bulb is Good one of the connectors on the back side the truck side of the connections was not soldered together with the wire, and there is no voltage on the line to the tail lamp, going to have to trace the tail lamp wire back.
more to come...