relay for a compressor

breaker or relay?

its like a stinger relay,but im lost on where to connect the second wire thats comes from the switch

that will be your input for 12volts

X2 on the breaker, sucks to blow a fuse in the middle of no where.

Yeah Breakers are definately the way to go instead of fuses. Its good to make sure that you reset it from time to time. Helps against corrosion incase it does short out and it cant trip

were can i get a breaker at?

i am using an 80 amp 100% duty cycle relay from napa like 18.00 works great on my two 380s