How do I find out the correct pre-charge air pressure for my captive air water tank?
Pressure Switch

I've never seen a "safety cut-off" on a pressure system before, but typically the switching is done by a single box (known as a "pressure switch"). Pretty much all of them (at least from the last ~20 years) look something like this:



The large nut is used to control the pressure (both cut-in, and cut-out) and the small one controls the range between the two.

Finding on and off pressure

First of all, you need a working pressure gauge to be able to do anything, so replace that.

To find the current setpoints: 


Run the pump until it shuts off (this is the off pressure)
Open a tap or two, and wait until the pump cuts in (this is the on pressure)


Btw, 95psi is really high. Most homes run 40/60 or 50/70. International Residental Code maximum is 80psi (IRC P2903.3.1). Beyond that, you'll potentially start having issues with leaking toilet valves in particular, but other failures are possible as well. 

Bladder tank pre-charge

Normally the pre-charge should be set to 2psi below the on pressure, but if your tank recommends setting it the same it shouldn't make a huge difference.