14. The E-Street wireless tablet can be mounted inside the car during the idle adjustment and self-learning testdrives; the easy-to-read display shows you how much the wide-band is correcting to fine-tune the fuel map. A choice of display screens can be selected from—this one shows engine rpm, engine vacuum, coolant temp, air/fuel ratio set point, actual air/fuel ratio, and active correction percentage. During the self-learning process you can see the ECU learning the fuel table and feel the result through the seat of your pants at the same time. It’s very cool when that happens.