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?

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

HEAVY DUTY / MADE IN USA- Featuring an L5-30 Plug to L5-30 Connector on TF Flextreme Cable. Rated for 30 Amps and 125/250V. All custom built Iron Box

NEMA L5-30 Extension Power Cord - 25 Foot, 30A/125V, 10/3 SJOOW, UL Listed - Iron Box Part # IBX-5801-25-C

Westinghouse

30 Amp Generator Cord and Power Inlet Box (Pre-Drilled) Waterproof Kit, 25 Feet Nema L14 30p Generator Extension Cord with L14-30P to L14-30R Twist Lock Cord Plug for Outdoor Use,125/250 Volts

electrical panel - Is it possible to use the 240V wiring for a dryer to also run a compressor? - Home Improvement Stack Exchange

Generator outlet L5-30 .vs a unit with L14-30 outletfor home emergency use, Page 2

electrical - How can I replace a NEMA 6-30 cord & plug with a NEMA 14-30 cord & plug? - Home Improvement Stack Exchange

220v compressor switch

How To Wire A Pressure Switch - MASTERTOOLREPAIR.COM