nice to meet you,
actually my present work going in the same way,
last Thursday i was in meeting with someone from total discussed about IFSF protocol to build mother board which is able to connect with dispensers our bread board going to communicate with "SOMO,, Tokheim, and others type"
the tank measurements had been done our system web based desgin,
so if you are looking for solution please feel free to contact me here,,,,
BTW, i have three years experience in prototyping works, and familiar with arduino and other micrcontrollers, your components says you have three tanks, so we can built time schedule from now,