This is a used SH4 pickup. I am reading 8.7 to 8.03 on the multimeter.
on the Trem side the other TB4 is giving me 18+
What should be the right number?
connect the white and red wires (if they are not) then see what the DC resistance is

If I remember right, it should be around 14
2002 PRS CE22
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+1, you are probably using just half of the pickup. Connect two wires(don't know the color) to use full humbucker, or think about push-pull potentiometer, for coil split