Don't have figures for A320 but A330 system setup is more or less identical.
The displayed pressure is called
Pr (Regulated Pressure) and is the pressure downstream of the (PRV) Pressure Regulator Valve.
The pressure upstream the PRV is called Pt (Transferred Pressure) this pressure is not displayed but is an input to the BMC.
The measured Precooler Outlet Temp is displayed and also regulates the cooling air(fan outlet air) by a modulating valve (FAV)
The values of the transferred pressure and temperature at TO could go up to ~
145psi/~370°C.
Normally the PRV will reduce this pressure to 48psi and the Precooler cools it down to 200°C.
Some specific system demands/overpressure/overtemp will have an effect on the output values.