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By default the percentage in the top right of the first screen is engine load. You can check the name of the PIDs by pressing both right and left buttons at the same time.
There are several PID's that can use a percent character: Engine Load, Throttle, Relative Throttle, EGR, EGR error, Fuel Level, and various other throttle position pids...
The program can be edited in any editor, but compiling this program must be done in the Arduino IDE which is a free download. The Arduino IDE is not a very good editor, but the source file isn't that large.
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