Garnet SeeLeveL Special 809-DM User Manual page 11

Program the 809-DM gauge for the correct number of tanks:
1. The 809-DM is fixed at six tanks for the main processor
software version 5.18 and above.
2. Previous versions were programmable for less than six tanks,
but this feature was removed since all applications had six
tanks.
reduced that possibility of errors.
809-DM Manual
This simplified installation and programming, and
Page 11