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There are three really useful things SG can show you, Load, Water Temp and Intake Air temp. The rest is nice but less important. IMO it probably saves 5-10% vs driving 'blind'.
If you don't want to spend on a SG, if you have an Android phone you can download Torque and buy a $10 OBD Bluetooth dongle on eBay. Look in the instrumentation section for the thread on it.
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