https://www.truck-manuals.net/mack/ INSTRUMENTS AND CONTROLS 69 25. Speed Control Switch — This is a V-MAC® switch; refer to the applicable V-MAC® Operator’s Guide for more information.
C0029150
26. Resume/Set Switch — This is a V-MAC® switch; refer to the applicable V-MAC® Operator’s Guide for more information.
C0029211
27. Optional Switch — See “Function of Optional Switches”, page 71. 28. Optional Switch — See “Function of Optional Switches”, page 71. 29. Optional Switch — See “Function of Optional Switches”, page 71. 30. Optional Switch — See “Function of Optional Switches”, page 71. 31. Air Filter Restriction Indicator (If Equipped) — Indicates that the element needs servicing or replacement. When the red flag locks into position, service as soon as possible to prevent engine damage; then reset the indicator after the filter change. Check the air filter restriction indicator daily. 32. Exhaust Pyrometer (If Equipped) — Indicates the temperature of exhaust gas at inlet of diesel particulate filter assembly. This helps the operator select the proper gear for load and grade conditions, thereby avoiding excessive exhaust temperatures. The maximum operation temperature is shown on the nameplate of the pyrometer glass.
