2002 Mitsubishi Pajero RPM METER

Electrical problem
2002 Mitsubishi Pajero 6 cyl Four Wheel Drive Automatic

Hi. I have Mitsubishi pajero 2002 model petrol engine while I start my car I can see the rpm meter variation, engine tune like 1 rpm and its showing variation like race goes to 2 after few seconds (10 Seconds) its goes down like below 1 rpm if any problem for the car acceleration please reply thx.