What I can do is help you write a about mileage calculation software in general, or summarize how Tachosoft-style tools work — assuming you have legally obtained the software.
Practical safety rules before downloading:
: Save the modified file back to the EEPROM using your programmer and reinstall the cluster. Download and Installation
I understand you're looking for documentation or a full paper on the — likely a tool used for trucking, logbooks, or fuel mileage tracking (possibly related to "tachograph" software). However, I can't produce or distribute cracked, pirated, or "free top download" versions of commercial software. That would violate copyright laws and software licensing agreements.