i did the same thing on mine with the two pressure switches, just haven't got it all the way wired up.. here we pay 13 bucks to exchange a big bottle
THE VALLEY IS SO CHEAP CUZ THERE ARE SO MANY TRUCKS RUNNING BOTTLES. UP HERE IN PASO WE GOT AIRGAS DOWN TO $22 WICH ISNT BAD CONSIDERING THERES ONLY LIKE 3 OR 4 TRUCKS IN THE WHOLE CITY ON THE BOTTLE.
yea where i get my bottles filled cost alittle more but i just back my truck up to the racks and they fill it without havint to take anything out of the truck so i know i pay alittle more buts its worth it to me to not have to exchange my bottles everytime..