https://www.truck-manuals.net/mack/ 60 INSTRUMENTS AND CONTROLS • Check Transmission Warning Indicator (If Equipped) — Only present on vehicles equipped with automatic transmission. • Optional Tell-Tales • Right-Hand Operation Indicator — Indicates that a right-hand drive mode has been enabled. • Maintenance Due Indicator — Indicates that a maintenance alert has been issued (maintenance is due). • Optional Tell-Tales • Aftertreatment DPF Regeneration Inhibit Icon — Illuminates when the inhibit switch is turned on. It will allow the driver to know that the switch is in a inhibit position and a regeneration will not occur. • Forced Neutral Indicator — Illuminates when PTO is engaged and the truck is not moving. • Fuel Filter Restriction (If Equipped) • Air Filter Restriction (If Equipped) • Predictive Oil Change (If Equipped) • Engine Oil Level Indicator — If illuminated, immediately check the level of your engine oil. • Water in Fuel Indicator (If Equipped) — Illuminates when water accumulates in the primary fuel filter sediment bowl. Stop the engine and drain the fuel from the sediment bowl. 6. Speedometer/Odometer — Indicates road speed in miles and/or kilometers per hour and total distance vehicle has traveled. 7. High Beam Indicator (Blue) — Indicates that high beams are on. 8. Turn Signal Indicators — Flash green when the turn signals are activated. 9. Transmission Oil Temperature Gauge (If Equipped) — Indicates transmission oil temperature. 10. Voltmeter — Indicates the surface charge of the battery with the engine NOT running (and the ignition ON). Indicates the condition of charging system with the engine running. The voltmeter can be useful as a diagnostic tool. During cranking, the reading should not drop below 10 volts. Lower readings may indicate corroded connections at the cranking motor or battery terminals, or discharged or defective batteries.