I have a few Air Zenith compressors in stock if anyone needs one. They are the compressors I recommend and run. Very nice and well built. Although its certainly not needed from a volume standpoint, it is nice to have 2 compressors. That ensures that if you have trouble with one, there is a backup and you arent stranded. Even if you had smaller whatever mounted but with a ball valve and non hooked up wire so you could plug it in as needed, you would be set. Also when I do an install, I always put an air chuck somewhere so the system can be manually filled up from an outside source. Again, just as a failsafe if you ever needed it.