Garnet SeeLevel I 705 Series Manual page 15

These senders are 6 inches long and cannot be stacked, they must be single.
They are identified by the "ALT" on the middle tab.
To program the sender for the correct tank:
1. Since the senders are all connected in parallel to save wiring and to
simplify installation, the senders must be programmed so they know
which tank they are on. The senders can be programmed for either the
fresh, gray, or black tank for three tank models, or for fresh, gray, galley,
or black for four tank models. This is done with the tabs on the top of the
sender. See the following diagram.
2. The senders default to fresh tank operation if the programming is not
altered. Consequently, if the sender is for the fresh tank, nothing further
needs to be done to it.
3. If the sender is for the gray tank, remove the tab that says "GRY" next to
it.
4. If the sender is for the galley tank (4 tank models only), remove the tab
that says "GRY" next to it, and the tab that says "ALT".
5. If the sender is for the black tank, remove the tab that says "BLK" next to
it.
6. This is all that is required to program the senders for the correct tank.
There are no correction tabs on this sender. However, if either the
"GRY" or "BLK" tabs have been removed and it should be for a fresh
tank, then remove the other "GRY" or "BLK" tab. When both the "GRY"
and "BLK" tabs are removed, it is equivalent to neither of them being
removed.
Short Single Senders