I have a further update in production.
This unit now logs fuel fills onto a micro SD card. Records when a fill or reset is done to a progressive text file that can be viewed on the mpguino itself.
I have included a flat ICSP header on the unit for easy upload if anyone has a go at bashing their own code. The stand alone nature of the unit requires an Arduino to be used as a programmer.
I also made the screen connection back to a ribbon cable for cheaper upgrades in the future or replacements (still haven't needed any yet however)
The user screens are now fully selectable with 5 pages for any configuration people may desire.
All of this can be expanded upon. 2 SD units remain unspoken for currently. Adding the SD card hardware and ribbon cable messing around only adds around $7AUD to the cost of the unit.