wire gauge ?

[blazer2007]

I was wondering, if a device like a air ride compressor needed 8 gauge for power and you used a larger gauge like a 6 Gauge is this a bad idea to run larger than necessary. I,m think this is true for house wiring . I also read to run the same gauge for ground but this was for stereo amps. Just trying to improve my limited wiring skills as alot of my wiring is wrong in my blazer and I,ve started fixing them. Haven't had problems YET but don,t want one. It,s like this wire is long enough, should work , ya right.