The only way other than that is to measure the air pressure in each line, but that will be a bit complicated without actually cutting the lines... Of course, you can always use a quick connector after cutting the lines (I always arry them in the Jeep in case I break a line), but I dont like to do more cuts than necessary. If you have a compressor at home, you can probably cut the line right at the ARB compressor and do a pressure test that wat, and later just run a slightly (less than an inch) air line... To be honest, I have never tried any of these ideas before as I have not had the need, so it may be better to ask someone with more experience. I can tell you, though, that my compresor quits at about 90PSI and kicks in at about 75PSI, so you are loosing about 15 PSI for the compressor to engage again.