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Old 06-14-2015, 08:03 PM   #7 (permalink)
freebeard
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It's actually a common practice.

http://www.amazon.com/Sunpro-CP7914-Super-Chrome-Tachometer/dp/B001M51IDK


http://www.summitracing.com/parts/sww-114919

Lights added to tachometers can indicate shift points, red-line or oil pressure. Why not an econometer.
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