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Congrats! I found several replacement pressure switches online from sources like Amazon. IIRC, spec is 80-on and 100-off, so an 80-100 or 85-105 normally-closed (NC) generic unit should do well for about $10. Adjustable units are also available, but I don't think there is much need for that...

@Retiredwarhorses - some info here: https://www.growlerforum.com/forum/garage/lighting/1563-air-compressor-wiring

I know you're aware of much of this, but for others in similar situations — A cheap multi-meter ($10-$20 for most work like this) is your best friend for this type of diagnostic work, quick and much safer as well. Two concepts for finding clues; first of which is to begin at a point you find...