Tachometer. Unless you have a manual transmission, and than, not necessary. REPLACE it with a guage that monitors the traction of the tires on the road. Very easy to do since the car already monitors slippage for stabilitrac. I have asked this many times in the automakers world. Think of the lives it could save. The guage would read green for traction, yellow for caution, and red for hydroplaning or low traction with a bell for a warning. Great for rain, snow, all over the country. Possibly let people know their car is not holding the road well
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