Excellent for saving fuel
This gauge is essential to me. It, of course, displays the engine code but I almost never use that function, I use it to display real-time readings my dash gauges don't supply. I use MPH (displayed in digital), coolant temp, average MPG, and current MPG. I drive 20,000 miles a year so fuel economy is important. Using the ScanGauge I can easily change how I'm driving to give the best MPG - just easing off the pedal can boost it 5 or more MPG without changing speed. Knowing the exact coolant temperature is, of course, important so the engine doesn't overheat, but on the other side, it's important not to start driving until the engine reaches a minimum temp, especially in cold weather.
You have four different readings you can set it to monitor, basically any data your vehicle's computer gathers, and you can add other non-standard readings by entering code sequences from their web site. I have mine plugged in all the time velcroed on the dashboard.
I've been using the ScanGuage for at least 10 years in three different vehicles. If this one ever fails I'll buy another.
Verified purchase: YesCondition: Pre-owned