If using a .png for the needle, can you use a specific needle per dial? ex: needle_.png. Trying to account for various size dials using the same style of needle

The Yellow/Red carets on the dials.. How do you disable those? Are these ticks? Or are ticks a different concept? The ticks that I envision are part of the dial_background.png, so what concept does “ticks” encompass?.

How does one determine whether a dial uses a needle or a meter. If a meter how does one go about customizing the “meter” indicator