Compatible w/ Most Two Wire Sine Wave And Three Wire Hall Effect Vehicle Speed Sensors,Features Metric And Imperial Scalings For Easily Relatable Readings w/o The Need For Mental Unit Conversions,Capable Of Registering One-Million Miles with Two Resettable Trip Odometers,Reprogram At Any Time To Accommodate Changes In Gear Ratio Or Wheel And Tire Combination,Unique Three-Dimensional Dial Design Gives Added Depth And Style To Your Custom Dash,Modern White LED Through-The-Dial Lighting Provides Clear Visibility During Nighttime Use,Simple Push Button; 2 Mile Drive Calibration; No Dip Switches