On-board air, found a different solution after my other under-hood attempt failed.
Also installed the E-air cowl, trimmed the rubber cap and it covers the hose coupler nice and snug; no dust to worry about.
I have a single hose to fill all 4 tires so I may move the coupler to the front on the same bracket as the compressor bracket and then could use a much shorter hose to connect to the compressor. I didn't think this process through
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