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I like that that compressor already has an air drier on it.

I bought one of these from HF to plug into the engine bay port. It is 5db quieter and is a bit higher PSI.
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HF air compressor 
It is way more quiet than the pancake compressor I was using as a backup to the backup.

I've often wondered about taking the pump off and installing it where my current pump is should that one fail.
Has anyone else done this or gone any further than wondering about it?

I like it that you have an outlet in in your engine bay.  I was just talking with someone today about wishing I had a plug in every bay, including engine.  I'm also thinking about carrying a spare of the California I asked about as it's small enough and then in a pinch I could just put in one of my bays that has a an outlet and run my air hose back to the aux port.  Only upside to me doing it this way it would be pretty quiet stashed up toward the front in a bay.