If your house circuit is in good order and you can trust your circuit breaker another option could be to use a smaller motor pulley and check amps with a clamp on ammeter (they are cheap at harbor freight)https://www.harborfreight.com/digita...ter-96308.html
The smaller pulley would give the motor more leverage so less HP (amps) would be required to drive the pump. There are limits as to how slow you can run the pump for oiling requirements, check pump specs.
at 0 lbs pressure in the tank motor load (amps drawn) should be low 10 amps or so. as the pressure rises more resistance will be exerted on the motor by the pump requiring more HP from the motor (more amps) HP in electric motors is determined primarily by amps drawn
you could adjust pressure cutoff switch when you see the current approach 20 amps. say 80,85,90 lbs or so to set shutoff power to the motor. Stressing your wiring at 20 amps is not
Only drawing up to 80%of a circuit rating is
recommended for normal and extended use.
20-amp Circuit example:
Total Wattage Capacity: 20 amps x 120 volts = 2,400 watts
Safe Wattage Capacity: 2,400 watts x 80% = 1,920 watts
Safe Amperage Capacity: 20 amps x 80% = 16 amps
In any case using 120 volt for this compressor, you will be pushing the limits and stressing possibly old wiring, NOT recommended! buy a smaller electric motor https://www.harborfreight.com/engine...tor-67842.html
+ smaller drive pulley or wire the garage outlet correctly, the only sane choices!
by the way a smaller motor drive pulley is mandatory. If you use the 2 HP size pulley the load will try to get it out of a smaller motor regardless and current will raise to the same (24 amps) despite the lower rated HP motor, there are no shortcuts. I can help with pulley size required/recommended for lower HP drive motor