So how to tell what series your VY is and what series fuel sender is present in your car if your unsure or want to be certain!?
Top your fuel tank up to the top and then open up the "engineer mode" (see open engineer mode if unsure how to).
scroll through the options until you find the menu stating "Fuel ohms".
This value provided decides whether your cars fuel sender is S1 or S2.
If your car is a Sedan, the Ohms reading is around 240-250ohms (Sedan) then your car has a Series 1 Fuel sender thus need a Series 1 Cluster configuration.
If the Ohms reading is around 40-70ohms (Sedan) then your car has Series 2 Fuel Sender thus needs a Series 2 Cluster configuration
If your car is a Ute, ohms reading round 165 - 240ohms is Series1 and ohms readin around 40-65 ohms is Series2.
Now anyone wondering why its so important to know what series fuel sender they have and not just what series there car is?. Because The early Series 2 cars used both Series 1 and Series 2 fuel senders (Yes, Annoying). So Its best being absolutely certain what your current fuel configuration is!.
Below is an example of a Series1 sedan Configuration, Notice how the largest ohms match the largest volumes, vise versa for S2.