Who would purchase an add-on kit to allow you to hook up your compressor to your tyre, walk away, and have it cut out at the pressure you set? Very handy for airing up while you pack up camp.
With a little help from a friend (who supplied stuff at good mates rates

) I have a system under the bonnet, hanging off my ARB compressor, which does just this. It's even IP65, so I don't have to worry when I'm hosing the engine. The compressor still works normally for lockers, and the system is simple to bypass if it ever fails.
Unfortunately, buying everything list price is ridiculously expensive

but the company in question may offer a "kit" at a substantial discount. The kit could probably be put together cheaper without the IP65 rating, which would probably be OK for those without the compressor mounted under the bonnet.
So, anybody interested, or is it a nerdy toy?
Cheers,
Scott