I am looking to see how far away I can put the tank from the pressure switch. I have a crawl space with minimal height and access near the switch due to steel girders (mfg home). I can put one in the middle of the crawlspace but that would make it about 12 ft away from the switch.
If you stop the pump, empty both tanks of water, set the correct air pressure in the tank near the switch, then set the air pressure in the remote tank 2-4 psi higher before you turn the pump on to refill the system, this will guarantee that the remote tank stops filling before the tank near the switch.
That will prevent the short cycling that having a tank far from the switch can cause. By having the pressure a little too high in one tank, you will lose a small amount of capacity that the added tank brings, but the amount will be negligible and the pump protection valuable.
EDIT: Based on further comments, if this below is what you want to do, I recommend you don't do it.
Setting up like this will cause short cycles and could cause the pump to chatter on and off repeatedly under certain conditions of flow. You could wear out your pump pretty quickly that way.
Note that if you can run a pipe 12 feet, you can run wire the same distance and put the switch wherever the tank is.
