The Scangauge II plug-in monitoring system enables the owner to access diagnostic codes whenever the "check engine" light illuminates. Read MPG's as you drive! or RPM or Engine Temps, etc. Everything the mechanic reads from your cars's OBD II to your ECM can be viewed at your fingertips while driving! NOthing like it on the market today and for this low price. The next thing close is $900.00 You can SAVE GAS UP TO 30% MILEAGE just by watching the way you drive and monitoring the Scangauge II. Also enables resetting of the "check engine" light and monitoring of numerous parameters in the ECU via the OBD-II connector of any car model since 1996. Parameters that can be monitored include all the engine control parameters plus calculated parameters including miles per gallon, gallons per hour, gallons remaining in tank, etc. Works only on OBDII computers '96 to 2012 cars and trucks. Is compatible with most 14.7/1 to 100/1 MAP sensor potentiometer lean out knob on the dash. Interested? E-mail us. Read more about the Scangauge II * The Scangauge II is the best deal for anything that comes close to it's capabilities of monitoring your ECM. You can read & clear codes, if you get a "check engine light."