Someone who is less tired than me will be able to tell you what the cabin pressure should be at 10,000ft based on the fact that the diff will read 4psi.
I used to fly with a guy who would always say "10-4 good buddy" in his best truck drivers voice every time we climbed through 10,000ft. Ten for the altitude we were passing, four for the diff that he would check. Now, years later , I can still hear his voice and alway glance up and check.