I'm trying to change the dashboard guage to have a colour both sides on the pointer as in the images, the first image shows it as it is the other what i am trying to achieve. It could be done if the light grey background semicircle of the guage was green and was overwritten by the red when the guage moved.
Not too many options for different gauges.
Alongside the dashboard default there is some contributors versions of gauges available Gauge nodes for dashboard
And then it is possible to use some JavaScript library which satisfies your needs. For that it takes to use the ui_template node to load the library and use it to present the graphics.
Looks like I'll have to be satisfied with what I have, the gauge nodes don't really do it for me and I'm afraid JavaScript is one step beyond for me but thank anyway.