Here are the books for GATE Instrumentation Engineering you can prefer.

Mathematics-  Advanced Engineering Mathematics by Erwin KreyszigGate, Engineering Mathematics by MADE EASY.

Network Theory- Engineering Circuit Analysis by Steven M. Durbin, Jack E. Kemmerly , William H. Hayt

Analog Electronics- Fundamentals of Microelectronics by BEHZAD RAZAVI

Digital Electronics- Solved previous year questions from EC and IN streams

Signals and Systems- Signals And Systems (Schaum’s Outline Series) by H P HSU Signals & Systems by Alan V. Oppenheim

Communication Systems- Modern Digital and Analog Communication System by B P LATHI

Electrical and Electronic Measurements- A Course In Electrical And Electronic Measurements And Instrumentation by A K SAWHNEY

Control System- Automatic Control Systems by B C KUO

Process Control- Process Control: Modeling, Design, And Simulation by B. Wayne Bequette

Transducers- Introduction to Measurements and Instrumentation by ARUN K GHOSH

For further information you can go through with given below link.

GATE 2018 Enstrumentation Engineering

Good luck!

Below are the recommended books for your preparation

Mathematics-
-Advanced Engineering Mathematics by Erwin Kreyszig
-Gate Engineering Mathematics by MADE EASY

Network Theory-

Engineering Circuit Analysis by Steven M. Durbin, Jack E. Kemmerly , William H. Hayt

Analog Electronics-

Fundamentals of Microelectronics by BEHZAD RAZAVI (Must Read Recommended by Aditya)

GATE - Electronics & Communication (Analog Circuits Volume 5 Of 10) by R K Kanodia

Digital Electronics

Solved previous year questions from EC and IN streams

Signals and Systems

Signals And Systems (Schaum’s Outline Series) by H P HSU Signals & Systems by Alan V. Oppenheim

Communication Systems

Modern Digital and Analog Communication System by B P LATHI

Electrical and Electronic Measurements

A Course In Electrical And Electronic Measurements And Instrumentation by A K SAWHNEY

Control System

Automatic Control Systems by B C KUO

Process Control

Process Control: Modeling, Design, And Simulation by B. Wayne Bequette

Transducers

Introduction to Measurements and Instrumentation by ARUN K GHOSH

You can consider below books -

For Electrical Networks - Alexander Sadiku For Analog circuits - Sedra & Smith For Engineering mathematics- R.K kanodia For Industrial instrumentation- A.K Sawhney For Systems and signals - Willsky For Control systems - Manke For Digital circuits - Morris Mano or Toci For Communication circuits- Singh and Sapre.

Also, better to get handwrittern note as this will be very helpful for your preparation and do practice each and every problem in CONVENTIONAL manner as well.

Hope this helps!!!