Actual pressure with direct reading gauge, not the electric one car comes with, is about 55 cold and 20 hot at idle.
If electric gauge sender working correctly, you will get the same reading on gauge in instrument cluster.
My currently installed almost new sender works as advertised so I get those readings and it goes to about 15-20 hot at idle and about 45-50 hot under power.
If you have the typical old tired sender in most Alfa's you may see needle drop to 0 at hot idle and not much more under power.
Daily drivers: USA models 91 Bianco 164B 5-speed - ALFA 4ME, 91 Argento aka "Quik Silver" 164B w/AT 1QUIK AG, 91 Argento 164L w/AT aka "Quik Silver 2 - ALFA 4US and 93 Rosso 164L 5-speed - ALFISTO. Rescue projects: Organ donor 91 Nero 164L w/AT and 91 "Old Blue" 164L w/AT "A day without an Alfa whine is like a day without sunshine"
my gauge shows me 4 (middel) when i start the engine after a long "sleep".
when she is hot (she always hot ) the niddel is no '2', in action the niddel is on '4'.
Daily drivers: USA models 91 Bianco 164B 5-speed - ALFA 4ME, 91 Argento aka "Quik Silver" 164B w/AT 1QUIK AG, 91 Argento 164L w/AT aka "Quik Silver 2 - ALFA 4US and 93 Rosso 164L 5-speed - ALFISTO. Rescue projects: Organ donor 91 Nero 164L w/AT and 91 "Old Blue" 164L w/AT "A day without an Alfa whine is like a day without sunshine"