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That's what I was afraid of. Is it possible to send the controller a new image, then trigger the display, then refresh the image, etc.?

Some models of external VFD displays allow you to do this, in the form of a serial protocol for doing bitmaps instead of text. There was already a project shown that did this, it was something Hugo cooked up. So yes, it can be done, and there are already projects that do this. None of them have been made publicly available in terms of the software and hardware details.

Someone please provide a link to the thread with the VFD thing that Hugo showed? It was the one that integrated into the speedometer of the new sports car he was getting...
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Tony Fabris