Hey Steve, AFAIK there is no font even close, and from gauge to gauge, manufacturer to manufacturer, there are many variations. I'm pretty sure some of these were hand painted, and many gauges show raised think paint application.
I'm at work now but I'll look into it when I get home.
If you've read any of my other posts on instrumentation you'll know I'm a stickler for doing this stuff right, not relying of a pre-made computer font. I feel that these things lose their character and become down right generic if a computer font is used.
Anyway, I'll come up with more info for you later.
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