Service Tools - Air Intake System Section 10 - Air Intake System M11 Page 10-2 Service Tools - Air Intake System The following special tools are recommended to perform procedures in Group 10. The use of these tools is shown in the appropriate procedure. These tools can be purchased from your local Cummins Authorized Repair Location. Tool No. Tool Description Tool Illustration Dial Depth Gauge ST-537 Measure the turbocharger axial motion.