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. Wow! Those boot shields are nice and beefy. Much nicer than the sheetmetal that comes from the factory... You may want to carefully inspect those front tires. The sidewalls look pretty cracked in that bottom picture. If you happen to be running tubes and flaps, you might be "kinda" okay...

. The shield maybe but CTIS air is supplied through the axle so you have a choice of Lockout Hubs or CTIS. Can't have both (so far as I know).

. The "service" connection is where air is pushed through the line from the brake peddle out back to cause the brakes to "apply" and cause the trailer to stop (IE: Service Brake). The "emergency" connection fills the tank and lines in your trailer connection on the back of the truck. It...

. Best part is that those two little clips that "ride the slot" in the window is something that even an old "ham-fisted" guy can remove or put back. That way the younger folks won't lose those clips...

. Hopefully you will pass the inspection! Yeah, those 4 quarter turn fasteners (Dzus) on the gauge plate are supposed to create the ground but after 30 or 40 years things get a little corroded. ;-)

. My best guess would be a grounding issue on all but the Tach. I would suggest a good clean place on the dash plate and another on the dash panel with a ground wire between them. Use a pencil and shorten the ground - but leave 2 or 3 feet of ground so you can work on the dash plate in your...

. Your truck will be happy with 80w90 in the rear ends and in manual transmissions and transfer cases.