Compression Test Results

I just did a compression check on my 318.

1 - 116
2 - 145
3 - 140
4 - 140
5 - 135
6 - 133
7 - 122
8 - 120

Now I have an issue with cylinder 8. When I did the test I was not getting a reading. Then after about the 3rd or 4th crank I would get a reading. Not steadily going up like the other cylinders.

What do you think??