Sorry. I was just thinking about this post and that it was lacking description.
The "kit" is a single air line that goes all the way around the truck with T fittings and a spur line to the first three tires. The last tire just gets the line end. Each tire has a QD tire valve. The end is standard QD air line. The gauge has one male, and one female connection, and a valve. The gauge is liquid filled for stability.
Use: connect to compressor line (shop or on board air, I have both) connect each tire, and fill all four tires and once. Open the valve to fill, close the valve to check what you've filled to. Obviously this set up can be used to air down all four tires quickly and do so in a balanced fashion as well. Open the valve to deflate, close to check. Just need a cable bag to store it in.
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