The Edge Insight CTS2 Comprehensive Gauge Display # EP84130 referenced in your question is a great product, however it will not be able to help with the gears or increase your gas mileage in a direct way. This is a monitor only system that will provide you with various vehicle parameters in an effort help you better understand the vehicle performance and offer insight as to improvements you can make with your driving habits.
The screen will display things like engine coolant temperature,... view full answer...
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