ScanGauge II Ultra Compact 3-in-1 Automotive Computer with Customizable Real-Time Fuel Economy Digital Gauges Programmable 3-in-1 automotive trip computer, diagnostic scan tool, and up to 37 digital gauges in one (vehicle dependent) Watch fuel consumption, cost-per-mile, coolant temperature, engine speed, horsepower, and much more in real time Works on all 1996 or newer OBDII cars, including gas, diesel, propane and hybrid vehicles Checks for Diagnostic Trouble Codes (DTCs), clears the codes, and can turn off the "Check Engine" light No tools required for installation, small size fits nearly anywhere in the vehicle. Color backlight display