electrical - 240v L14-30R wiring air compressor switch - Home Improvement Stack Exchange

I purchased a Campbell Hausfeld 6 hp 60 gallon DK400121AV. It's supposed to run on 240v, but the guy I bought it from had a 120v plug wired to it. How do I wire a L14-30P plug to the pressure switch?

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electrical - Plugging compressor into 240v dryer plug (NEMA 10-30R) - Home Improvement Stack Exchange

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electrical - Plugging compressor into 240v dryer plug (NEMA 10-30R) - Home Improvement Stack Exchange

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Hooking up my compressor to my dryer outlet - Home Improvement Stack Exchange