If bulk (and budget) is an issue, try something like this. I 'made' one for my bike. Couldn't be arsed with making a new cover, just ripped of the plastic housing, shortened the hose to the gauge, and wrapped it up in a lightly oiled rag - about 1/4 the size. You just have to hold it very carefully when using it:
https://www.horizonsunlimited.com/tech/minicompressor
Might need to extend the batt connection wires or the hose if using it on a 4x4.
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