Operator Cab and Controls - Section 32 3/10 OM3216 Page 32-22 METER DISPLAYS FIGURE 32-14. EDP - METERS 1. Torque Converter Oil Temperature Gauge 2. Engine Water Temperature Gauge 3. Engine tachometer 4. Speedometer 5. Retarder Oil Temperature Gauge 6. Fuel Gauge Speedometer Engine Tachometer The engine tachometer displays the engine speed. The speedometer indicates the travel speed of the truck. When engine speed exceeds 2250 rpm and moves into the red range on the meter, the alarm buzzer will sound and the central warning lamp will illuminate. Reduce engine speed to prevent damage to the engine.