What texts should I be checking out for instrumentation?
Well I would like to make sensors for measuring data in physics.You might need to be a little more specific. Do you mean Electronic instumentation and at what level?
If you are thinking of doing a course on instrumentation, the specified text for the course would always be a good advance purchase.
You could also approach the teacher of the course and ask if there was any text or web site that might be useful to study before the course began.
Instrumentation always involves a detailed application of electronic theory, so some study in that area might be good if you feel you need it.