[Richard L]

The factory default of the HFS3 is 79% IDC and 30% boost. We believe this is the most ideal set up, true to engine load.

If you wish to control flow based on boost only, you need to cut IDC and solder link MPS on the underside of the circuit board. see page 20.4.

This assumed you have wired up the map sensor signal to the blue wire of the grey harness and red wire to furl injector (+).