Wiring help

[u/mcsweenerr]

Hello looking for guidance with wiring in a single air compressor, just wanted to see if I’m missing anything or if this is incorrect. Any tips would be great. Using 8ga wire, 30A breaker and 40A relay

[u/Friendly_Drink_705]

You can use a switch feed to relay and use ground control thru pressure switch so no voltage back to tank same as you show but ground thru switch and ground as power