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I think I may have mis-spoke, your MPGuino should be storing your Contrast, VSS Pulses/Mile, MicroSec/Gallon, etc. to EEPROM (meaning it doesn't require power to save). This way people don't lose their presets when they update the code, so you probably have numbers stored. I am going to guess that if you were able to get to the second screen when all you saw was blocks, you may be able to scroll to the "tens" number and adjust it (Even if you can't see it), and same with the "ones" number.
BTW, I am able to hook the MPGuino up to the the computer by USB connection and operate it just like it was in the car (only I don't get signals, like with my car off). It may be easier for you to do things from your computer.
NOTE:
Since I have only changed the "Hundreds" number, I have no idea what the other two numbers even do, so if you wanted to, you could go through all of the 100 settings (by changing the numbers you can't see) pretty easily if you were up for it.
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