The Subaru STI from 2004 to 2007 and 2008+ use a saddle fuel tank. This means they will have 2 fuel senders, one of each side of the tank, and both must be accounted for when trying to get the accurate fuel level in the tank. Below there is data on each sensor individually, and combined together, which is the signal you want to use if you are wanting to get OEM fuel level into your Haltech ECU or dash. 

2004-2007 will use this data:

2008+ will use this data:

Haltech has several inputs that you can use to read the fuel level, and each input has the option to have different pull ups, which will effect the values you enter. 

Above you can see there is a value for a 120 ohm pull up, 240 ohm, and 1k.

There is also data for the Haltech fuel level conditioner if you have it. 

Make sure to enter the data that follows the pull up you used for this.

If you have any questions please reach out to tech support at 888-298-8116, or email the office closest to you.

Their addresses are found here: