Compatible with most gasoline ODBII equipped vehicles from 1996 to present. Includes 5ft. Wiring Harness with 1 wire installation which easily plugs into OBDII port. Displays RPM Speed Instant MPG and Average MPG.. Installs in minutes!. Ecometers Ecograph Helps You Improve Your Driving Habits To Increase Your Fuel Efficiency And Reduce Your Fuel Costs.