PointerSpeedometer pointerSpeedometer= (PointerSpeedometer) findViewById(R.id.pointerSpeedometer);
// change speed to 50 Km/h
pointerSpeedometer.speedTo(50);

// in this speedometer, you can change UnitText Size
pointerSpeedometer.setUnitTextSize(15); //def : 5dp
// change the point color
pointerSpeedometer.setPointerColor(Color.RED);
// change Sweep speedometer color
pointerSpeedometer.setSpeedometerColor(Color.GREEN);