doing the needles isn't that crazy really, if the gauges are all the background image for that page then you would need maybe 30 different needle images, maybe 2 times for large & small. that's not hard at all & could be done, what are you thinking that would be "several thousand" images???
even if the gauges are all individual, you just assemble them into a background image & they stay static
you then create a square image & put a pinpoint in the center, this is the point the needle rotates on, 30 images should be more than enough resolution, these same 30 images can be ALL the needles for ALL the gauges, the square needs to be transparent though, that's were saving as a *.png comes in, cause png's support transparency so the gauge shows & the only non transparent part, which is the needle itself shows on top of the gauge.
each sensor reading would corilate to an image, from 1-30... no thousands of images necissary

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