Just wondering if anyone knows where I can get a pressure indicator switch that is adjustable to 90 psi. I can find transducers, which only come on when a pressure is met, but I want a switch to indicate when pressure falls below 90 psi. Thanks
McMaster Carr has a wide selection of pressure switches for this application. Also, if you look up Nason brand switches, they have an extensive catalog as well, with many models and configuration options. I bought one of them through an online distributor once, but I can't remember specifically who it was. I was using it for the exact same function as what you described, and it has worked well.
