English 
gm speedometer gear chart
First gear: it is used when starting normally or climbing a steep slope, and the speed is generally 10 km / h;
Second gear: the excessive gear for accelerating after starting, or the use of low-speed forward, the speed is generally 20km/h;
Third gear: this gear is used when the speed is 20-40km/h, and it is often used when driving in urban areas;
Four gear four: use this gear when the speed is 40-60km/h;
Fifth gear: this gear can be used at a speed of 60km/hy;
GM General Motors abbreviations:
1-GR:1st-Gear-Status
123R: 1-2-3-RNG
2-GR: 2nd-Gear-Status
3-GR: 3rd-Gear-Status
4-3: 4th/3rd-Downshift
ABSL: ABS-Lamp
ABSR :ABS-Relay
ABSS: ABS-Stop
When driving a manual car, the most important thing is to grasp the timing of gear shifting. When the engine speed is about 2000 rpm, reduce the throttle first, and then press the clutch, so that the clutch will not be forcibly disengaged, and then shift.The shift sequence must be first gear -- second gear -- third gear -- fourth gear -- fifth gear. Skipping is not recommended. The downshift sequence is based on the vehicle speed. According to the situation of your car, generally, if the engine speed is less than 1500 rpm, you need to downshift.Cars basically have an economic speed range, and it's OK to keep the engine speed in this range when driving at ordinary times. If the speed rises quickly and needs to exceed this range, then upshift. If the speed is too low, then downshift. In addition, you should overtake, climb and downshift in advance when going downhill. If you want to drive violently, then let the engine speed reach the red line and then shift. Most cars can upshift at 2500 rpm. If the speed is too low, upshifting is easy to cause engine carbon deposition, and if the speed is too high, upshifting will affect the increase of fuel consumption.The economic speed of the engine is mostly 1500 to 2500 rpm, and it is OK to keep the engine in this range as far as possible when driving. As you become proficient in driving technology, you don't have to check the table, and you don't have to look at the tachometer. You can judge whether you want to shift gears by feeling.
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