If a designer creates a disc assuming a linear arc (equal spacing between every 10 km/h), the speedometer will read incorrectly. The vector paths in the PDF must mimic the original swept-angle geometry of the specific speedometer model (e.g., a 140° sweep vs. a 240° sweep).
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Given the lack of specific design requirements, I'll guide you through creating a simple template. For a more intricate design, you might want to consult graphic design software or services. If a designer creates a disc assuming a