hfs-3 to aem ems in 02 wrx

[Richard L]

The orange wire will send out a 5V signal as soon as you turn on the gauge. It will reaim to be 5V until failsafe triggered during an injection event.

You can invert the signal from 5V to 0V by linking the jumper.

As far as the AEM ineterface is concerned, AEM should have an input to receive this signal. Sometime is called nitrous map switch. Check with them.

Should something goes wrong with this link, you can still count on the aquamist's ability to reduce boost independently.