We really should know the compressor amperage here. One consideration, a compressor almost uniquely has huge start up current draws, meaning a typical rocker switch, will at some likely blow out is contacts after a number of starts under load. Better switches have a HP rating, but not sure if that takes into consideration a compressor type load. Stopping it with the switch when running also causes the contacts to arc slightly every time its turned off, again eroding the contacts. This is why "starters" are used in that the contact is quick, and forceful, and oversize. What you are doing will work, its not unsafe unless there are flammable vapors nearby, but will likely eventually fail.
A safety tip when doing the actual work, always "act" like every wire is always electrically hot, meaning if you touch it, don't simultaneous touch anything else ( were/how you stand is important) ie the bird safely sitting on the power line concept.
https://assets.gordonelectricsupply...VArSbvM813OeoUwHiIaTl0hdiuMaAn89EALw_wcBI'd guess #7832 is close to what is best solution for you, based on what little we know so far.
