since version 1.1.2 you can change the indicator, or remove it for All Speedometers.

just for Speedometer family.

add app:sv_indicator="" attribute (enum value) to your speedometer to change the indicator. like so:

<com.github.anastr.speedviewlib.SpeedView
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        app:sv_indicator="TriangleIndicator" />

speedometer.setIndicator(Indicator.Indicators.SpindleIndicator)

indicator Name	Screenshot	indicator Name	Screenshot
NoIndicator		NormalIndicator
TriangleIndicator		NormalSmallIndicator
SpindleIndicator		LineIndicator
HalfLineIndicator		QuarterLineIndicator
KiteIndicator		NeedleIndicator

indicator is Observable by its Speedometer, so.. one indicator must be added to one speedometer.
and so, to change width or color you can call immediately speedometer.indicator.width = 20f or speedometer.indicator.color = Color.BLUE without tack care of invalidate the SpeedView, because it's observing any change to indicator and do auto invalidate.
also you can change width and color in XML:

sv_indicatorColor=""
sv_indicatorWidth=""

you can add custom indicator, just add indicator's image to your drawable folder, and use ImageIndicator Object.
must set the center of indicator in the center of image, and the indicator towards the top,just like this one:

to create object you cans use: ImageIndicator(context: Context, resource: Int) eysly, but we Recommend to use ImageIndicator(context: Context, resource: Int, width: Int, height: Int) to add custom width and height for indicator.

val imageIndicator = ImageIndicator(getApplicationContext(), R.drawable.image_indicator1)
speedometer.indicator = imageIndicator