Originally Posted by
slowto280
...but doing some related research, I find 'limits' shown in psid.
In what context did you see this "limit" mentioned ? Were you supposed to read a number somewhere on a gauge or was it just a psid at which something takes place, e.g., a bypass valve opens or a cockpit warning is sent for a clogged engine oil filter ? This would be a number one doesn't need to know and you'd have to get a MTC manual to find it.